Substance Use and Health

Introduction

Substances can affect how your brain and body work. Some substances are useful medicines when they are used correctly. Others, such as nicotine, alcohol, and illegal drugs, can harm health, especially during adolescence. This aiMOOC helps you understand how substances can affect health, how habits can develop, how social influences can shape choices, and how to seek help for yourself or someone else.

The goal is not to scare or shame anyone. You will learn to use evidence, make safer decisions, communicate clearly, and treat people with respect. A person who has problems with substance use deserves support and healthcare, not insults or blame.

During adolescence, the brain is still developing. Systems involved in reward, emotions, planning, and self-control continue to mature. This is one reason why learning healthy coping and decision-making skills in Grades 7–8 can be especially useful.

Learning Goals

By the end of this aiMOOC, you should be able to explain the difference between Substance use, Substance misuse, and Substance use disorder; describe how several common substances can affect the brain and body; identify risk and protective factors; recognize social and media influences; use refusal and help-seeking skills; and explain what to do when a possible poisoning or overdose is an emergency.

What Is a Substance?

In health education, a substance is a chemical that can change how the body or brain works. The term can include medicines, alcohol, nicotine, cannabis, and other drugs. Some substances are legal for adults in some places but not for young people. Laws differ between countries and regions, so health decisions should not be based only on whether something is legal.

A medicine is used to prevent, diagnose, or treat illness. Medicine can be helpful when it is taken by the right person, at the right dose, for the right reason, and according to directions from a healthcare professional or the label. Using someone else's prescription, taking more than directed, or using a medicine for a different purpose is unsafe and can be a form of misuse.

A psychoactive substance affects the brain and can change mood, thinking, perception, attention, or behavior. Not every psychoactive substance has the same effects or risks. Health effects depend on factors such as the substance, strength, amount, frequency, age, health conditions, and whether more than one substance is used.

Use, Misuse, and Substance Use Disorder

Substance use simply describes taking or being exposed to a substance. Substance misuse means using a substance in a way that increases risk or does not follow medical or legal guidance. A substance use disorder is a health condition in which substance use becomes difficult to control and continues even when it causes significant problems.

A substance use disorder is not the same as having "bad character." Repeated substance use can change learning, motivation, stress, and reward systems in the brain. Treatment and recovery are possible, and support from healthcare professionals, family, school staff, and trusted adults can make a major difference.

Why Adolescence Matters

Your brain does not suddenly become "finished" at a certain birthday. Brain development continues through adolescence and into adulthood. Areas and networks involved in planning, weighing consequences, learning from experience, managing emotions, and controlling impulses are still changing.

This does not mean teenagers cannot make good decisions. It means that practice, supportive relationships, sleep, healthy routines, and clear information can strengthen decision-making. It also means that repeated exposure to addictive substances during adolescence can interfere with learning and healthy development.

Dopamine is a brain chemical involved in movement, motivation, learning, and reward. Reward is important for healthy activities such as eating, exercising, social connection, and achieving a goal. Many addictive substances can produce unusually strong or repeated effects in reward systems. Over time, the brain can learn powerful associations between a substance and the situations in which it is used.

Tolerance, Dependence, and Withdrawal

Tolerance can develop when the body adapts to repeated exposure and a person needs more of a substance to get a similar effect. Physical dependence means the body has adapted to the presence of a substance. Withdrawal refers to symptoms that can occur when a dependent person reduces or stops use.

These ideas are related but not identical to addiction. A person can develop physical dependence on some prescribed medicines even when taking them as directed. A healthcare professional should guide changes to medicines that can cause dependence.

How Different Substances Can Affect Health

Different substances act in different ways. Some slow parts of the nervous system, some stimulate it, and others change perception or mood. Effects can also vary from person to person. Mixing substances can make effects harder to predict and can increase danger.

Nicotine, Tobacco, and Vaping

Nicotine is highly addictive. It is found in tobacco products and in many e-cigarettes or vapes. During adolescence, nicotine can affect brain systems involved in attention, learning, mood, and impulse control. Young people can also develop signs of nicotine addiction quickly.

Smoking tobacco exposes the lungs and body to many harmful chemicals. Vaping does not produce harmless "water vapor"; e-cigarettes create an aerosol that can contain nicotine and other substances. For young people, avoiding nicotine and tobacco products is the safest choice.

A useful refusal response can be short and calm: say no, give a simple reason if you want to, suggest another activity, and leave if the pressure continues. You do not owe anyone a long argument about your health choices.

Alcohol

Alcohol affects the brain and nervous system. It can reduce coordination, slow reaction time, and impair judgment. For young people, alcohol can increase the chance of injuries, unsafe choices, conflict, and other harms. Repeated heavy drinking during adolescence can also interfere with healthy brain development.

The amount of alcohol in a drink can vary, and effects are not identical for everyone. A person who appears "fine" can still be impaired. Never get into a vehicle with a driver who may be impaired by alcohol or other substances. Ask a trusted adult for a safe ride or use another safe way to get home.

Cannabis and Other Drugs

Cannabis can affect attention, memory, coordination, reaction time, and judgment. Products can vary widely in strength. During adolescence, frequent use is associated with greater risks for learning, mental health, and substance-related problems.

Other drugs can have very different effects. Stimulants may increase alertness and heart rate. Sedating substances can slow thinking, coordination, and breathing. Opioids can slow breathing enough to cause a fatal overdose. Inhalants can damage the brain and organs and can cause sudden, life-threatening effects.

You do not need to memorize every drug name to make a safer decision. A useful rule is: if you do not know exactly what a substance is, what is in it, or how it may affect you, do not take it.

Medicines: Helpful When Used Safely

Prescription and over-the-counter medicines are not automatically safe for everyone. Read the label, follow directions, and ask a parent, caregiver, pharmacist, or healthcare professional when you are unsure. Never share prescription medicine. Keep medicines in their original containers and stored as directed.

A medicine may interact with another medicine or substance. If a healthcare professional asks what medicines or substances a person uses, accurate information helps them provide safer care.

Mental Health, Stress, and Coping

People may sometimes use substances because they are stressed, anxious, sad, lonely, curious, or trying to fit in. A substance may briefly change how someone feels, but it does not solve the underlying problem and can create additional health or relationship difficulties.

Healthy coping skills can include physical activity, music, art, sleep routines, talking with someone you trust, breathing exercises, time outdoors, problem-solving, and professional mental health support. Different strategies work for different people.

If difficult feelings last a long time, become overwhelming, or make daily life hard, asking for help is a strong health decision. A school counselor, nurse, doctor, therapist, parent, caregiver, or another trusted adult can help you find support.

Risk Factors and Protective Factors

A risk factor is something that can increase the chance of a harmful outcome. A protective factor is something that can lower risk or help a person cope with challenges. Neither type of factor guarantees what will happen.

Possible risk factors can include high stress, easy access to substances, pressure from peers, family conflict, untreated mental health problems, and the belief that "everyone is doing it." Protective factors can include supportive adults, clear family expectations, positive friendships, school connection, healthy activities, coping skills, accurate health information, and access to healthcare.

Risk and protection exist at several levels: individual, family, peer group, school, community, and society. Prevention works best when it strengthens several protective factors instead of expecting one person to handle every risk alone.

Media, Advertising, and Social Influence

Images, music, influencers, movies, games, and advertising can affect what people think is normal or attractive. A product may be shown with friendship, confidence, adventure, or relaxation even when those images do not show the full health risks.

When you see a message about a substance, ask: Who created it? What do they want me to think, feel, or do? What information is missing? Is the claim supported by a trustworthy source? Does the message show short-term excitement but hide long-term consequences?

Social norms can also be misunderstood. Hearing a few stories about substance use does not mean "everyone" uses substances. Good decisions should be based on your values, health goals, reliable evidence, and safe relationships rather than on pressure to copy someone else.

Decision-Making and Refusal Skills

A simple decision process can help when you feel rushed or pressured. First, identify the choice. Next, think about immediate and long-term consequences. Then, consider your goals and values. Finally, choose a safe action and get support if needed.

You can prepare refusal phrases before you need them. Examples include No thanks, I'm good, I don't use that, I need to stay clear-headed, or Let's do something else. A confident tone, repeating your answer, changing the subject, moving toward supportive people, or leaving the situation can make refusal easier.

If someone keeps pressuring you after you say no, the problem is their behavior, not your refusal. Healthy friendships respect boundaries.

Recognizing a Possible Emergency

A possible poisoning or overdose is a medical emergency when a person is unconscious, cannot be woken, has severe trouble breathing, has a seizure, becomes dangerously confused, collapses, or develops other severe symptoms after taking or being exposed to a substance.

Get a trusted adult and emergency medical help immediately. Use your local emergency number or poison information service. Do not leave the person alone, do not encourage them to "sleep it off," and do not give them another substance to try to reverse the effects. Follow the instructions of emergency professionals.

If you know or suspect what the person took, tell responders. Accurate information can help save time and guide treatment. Your first job is to get qualified help, not to investigate or manage the emergency by yourself.

Helping Without Stigma

Words matter. Labels such as "junkie" or "addict" can reduce a person to a health problem and may make help-seeking harder. Person-first language such as a person with a substance use disorder focuses on the person, not the diagnosis.

You can care about someone without keeping dangerous secrets. If a friend is using substances, is being pressured to use, or seems unable to stop, speak with a trusted adult or healthcare professional. If there is immediate danger, seek emergency help.

Myths and Facts

Myth: Natural means safe. A substance can come from a plant and still affect the brain, cause poisoning, or lead to dependence.

Myth: Prescription medicines are safe to share. A prescription is chosen for a specific person, dose, and condition. Sharing can be dangerous.

Myth: Vaping is only flavored water vapor. E-cigarettes produce an aerosol that can contain nicotine and other chemicals.

Myth: Addiction is just a lack of willpower. Substance use disorders involve changes in brain, behavior, health, and environment. Evidence-based treatment and support can help.

Myth: Asking for help will make things worse. Early support can prevent problems from becoming more serious and can connect a person with safer options.

Trusted Sources for Further Learning

National Institute on Drug Abuse: Parents and Educators: Science-based information and learning materials about drugs and health.
Centers for Disease Control and Prevention: E-Cigarette Use Among Youth: Information about nicotine, vaping, and youth health.
National Institute on Alcohol Abuse and Alcoholism: Too Soon = Too Dangerous: Middle-school information about alcohol and health.
Substance Abuse and Mental Health Services Administration: Prevention of Substance Use: Information about prevention and early intervention.

Interactive Tasks

Quiz: Test Your Knowledge

Which statement best describes a protective factor? (Something that can reduce risk or support healthy coping) (!Something that guarantees a person will never face risk) (!Something that makes all substances harmless) (!Something that only exists in hospitals)

Why is nicotine especially concerning during adolescence? (It is addictive and can affect the developing brain) (!It is only dangerous when mixed with water) (!It improves attention in every young person) (!It has no effect on learning or mood)

What is the safest response when you do not know what a substance contains? (Do not take it) (!Take a small amount to test it) (!Ask a friend to try it first) (!Mix it with a drink to weaken it)

What can alcohol do in the short term? (Impair judgment and coordination) (!Make reaction time faster) (!Prevent all injuries) (!Improve every decision)

Which action is safest with prescription medicine? (Use it only as directed for the person it was prescribed to) (!Share it with a friend who has similar symptoms) (!Double the dose if one dose does not work quickly) (!Move it into an unlabeled container)

What does withdrawal mean? (Symptoms that can occur when a dependent person reduces or stops use) (!A guarantee that someone has committed a crime) (!A type of healthy exercise) (!A method for making medicine stronger)

Which statement about substance use disorder is accurate? (It is a health condition for which treatment and support are possible) (!It proves that a person has weak character) (!It can never improve) (!It only affects adults)

What should you do if someone is unconscious after taking a substance? (Get emergency medical help and a trusted adult immediately) (!Let the person sleep alone) (!Give the person another substance) (!Wait several hours before telling anyone)

Which question is useful when analyzing an advertisement? (What information or risks might be missing) (!How can I copy the message without checking it) (!Why should I believe every claim I see) (!How can I ignore who created the message)

Which behavior shows a strong refusal skill? (Saying no clearly and leaving if pressure continues) (!Agreeing because everyone else seems to agree) (!Taking an unknown substance to avoid embarrassment) (!Keeping silent when a situation feels unsafe)

Memory Game

Nicotine	An addictive substance found in tobacco and many e-cigarettes
Tolerance	Adaptation in which more of a substance may be needed for a similar effect
Withdrawal	Symptoms that can appear when a dependent person reduces or stops use
Prevention	Actions that reduce the chance of substance-related harm
Refusal skill	A communication strategy for saying no and protecting a boundary
Protective factor	A condition or support that can lower risk

Drag and Drop

Match the correct terms.	Topic
Trusted adult	A person you can approach for safe guidance and support
Peer pressure	Influence from people your age to act in a certain way
Medicine safety	Following the label or prescription and never sharing medication
Media literacy	Checking who made a message and what information may be missing
Emergency response	Getting qualified help quickly when severe symptoms appear

...

Crossword Puzzle

Nicotine	What addictive substance is found in tobacco and many vapes?
Dopamine	What brain chemical is involved in reward, motivation, and learning?
Judgment	What ability can alcohol impair when making decisions?
Withdrawal	What term describes symptoms after reducing or stopping a substance the body depends on?
Prevention	What term means taking action to reduce the chance of harm before it happens?
Counselor	Which school professional may help a student find emotional or health support?

LearningApps

Cloze Text

Open-Ended Tasks

Easy

Health Vocabulary Map: Create a one-page concept map connecting substance use, misuse, health, risk, protection, tolerance, and withdrawal in your own words.
Refusal Script: Write and rehearse a short conversation in which you refuse an offered substance, suggest another activity, and leave safely if the pressure continues.
Media Message Detective: Choose a fictional or teacher-provided advertisement about a substance and identify the audience, persuasive techniques, and health information that is missing.
Help-Seeking Card: Design a small school-safe card that lists three types of trusted adults or services you could contact for health, stress, or substance-related concerns.

Standard

Brain and Behavior Poster: Create an illustrated poster showing how reward, attention, judgment, and impulse control connect to substance-use decisions during adolescence.
Interview with a Health Professional: With teacher approval, interview a school nurse, counselor, pharmacist, or other health professional about prevention, medicine safety, and how young people can ask for help.
Substance Fact Check: Compare information from two trustworthy health sources about one substance and create a fact sheet that separates supported facts from common myths.
Healthy Coping Video: Produce a short video that demonstrates at least three healthy ways to respond to stress, social pressure, or difficult emotions without using substances.

Advanced

School Prevention Campaign: Design a non-stigmatizing campaign for students your age that combines accurate health information, refusal skills, and clear routes to support.
Protective Resources Map: Map the protective resources available in your school or community, such as clubs, counseling, healthcare, sports, arts, mentoring, and safe transport, and explain how each can reduce risk.
Case Study Analysis: Analyze a fictional situation involving peer pressure, stress, and substance use, then propose a response plan that considers health, relationships, safety, and help-seeking.
Community Health Brief: Write a brief for your class explaining how families, schools, healthcare services, media, and community rules can work together to prevent substance-related harm.

Learning Assessment

Decision Scenario Assessment: Explain how you would respond to a fictional situation in which a friend offers an unknown substance, and justify each step using health and safety reasoning.
Source Evaluation Assessment: Compare two substance-related claims from different sources and decide which is more trustworthy by examining author, evidence, purpose, and missing information.
Health Effects Assessment: Compare nicotine and alcohol by explaining at least one similarity and two differences in how they can affect adolescent health and behavior.
Risk and Protection Assessment: Given a fictional student's situation, identify two risk factors and two protective factors, then propose one realistic way to strengthen protection.
Emergency Reasoning Assessment: Explain why severe breathing problems, unconsciousness, or seizures after substance exposure require immediate qualified help rather than waiting for symptoms to pass.
Stigma and Support Assessment: Rewrite a stigmatizing statement about substance use disorder in person-first language and explain how respectful language can support help-seeking.

Evidence of Learning

Knowledge: You can explain key terms, describe major health effects of nicotine, alcohol, cannabis, medicines, and other drugs, and distinguish between risk factors and protective factors.

Skills: You can evaluate health claims, identify persuasive media techniques, use refusal language, make a safer decision under pressure, and name appropriate routes to help.

Products: Your concept map, poster, fact sheet, video, interview notes, campaign, or community brief can show how well you communicate accurate information for a real audience.

Reasoning: You can apply health knowledge to a new scenario, weigh short-term and long-term consequences, and explain why different people or situations may have different levels of risk.

Transfer: You can use the same source-checking, boundary-setting, coping, and help-seeking skills in other areas of health, digital life, relationships, and decision-making.

OERs on the Topic

The following English Wikipedia article provides additional background on the health condition known as substance use disorder.

Linked Learning Areas

Substance Use and Health

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