Cannabis, Health, and Young People – A Reality Check

Education for Peace Foundation – Reading for Critical Thinking and Healthy Choices

1. Why the “safe weed” story is incomplete

In many countries, including Thailand, the public debate about cannabis often sounds simple: some people say it is a “natural plant,” safer than other illegal drugs, and even a kind of medicine that should be fully legal. At the same time, health agencies such as the U.S. Centers for Disease Control and Prevention (CDC) CDC = a major public health agency of the United States government. and the World Health Organization (WHO) WHO = an international agency of the United Nations responsible for public health. warn that cannabis can seriously harm physical and mental health, especially for teenagers and young adults.

This reading does not say that cannabis is “the most dangerous drug in the world.” Instead, it shows why calling it “safe” or “harmless fun” is misleading. Using scientific research, we will look at how cannabis affects the brain, mental health, the body, and society – and why public policy must protect young people rather than the cannabis market.

2. Effects on the brain and thinking

The human brain continues to develop into the mid-20s. During this period, the brain is especially sensitive to psychoactive psychoactive = affecting the mind, mood, or behavior. substances such as THC, the main active chemical in cannabis. According to the CDC, regular cannabis use during adolescence and young adulthood can affect cognitive function cognitive function = mental abilities such as memory, attention, and problem-solving. , including memory, attention, learning, and decision-making.

Long-term studies from New Zealand followed people from childhood into middle age. Those who became chronic chronic = continuing for a long time or recurring often. cannabis users starting in their teens lost points on IQ tests and performed worse on memory and attention tasks as adults, even after they stopped using the drug. Their friends and family also reported more problems in everyday thinking and motivation. These changes were not fully explained by education, alcohol, or other factors.

More recent brain-imaging studies with adults aged 22–36 show that heavy or frequent cannabis users have weaker working memory working memory = the ability to hold and use information for short periods while thinking or solving a problem. performance and different patterns of brain activation during memory tasks compared with non-users. In other words, the brain seems to work harder while achieving less.

3. Mental health: from “relaxing” to serious risk

Many young people say they use cannabis to “relax,” “sleep better,” or “escape stress.” However, research shows that heavy use – especially beginning in early adolescence – is associated with a higher risk of:

• Depression and anxiety disorders
• Psychotic symptoms such as hearing voices or having paranoid beliefs
• Earlier onset of schizophrenia schizophrenia = a serious mental illness with symptoms like hallucinations and disorganized thinking. in vulnerable individuals

This does not mean that every cannabis user will develop a serious mental illness. But when millions of young people use high-THC products regularly, even a “small” increase in risk becomes a large burden for families, health-care systems, and society.

Another often ignored issue is motivation. Heavy cannabis use is linked to reduced drive to study, work, or pursue long-term goals. Young people may feel calm in the short term, but they may slowly lose energy and direction in life – a hidden cost that a simple “high” cannot show.

4. Physical health: lungs, stomach, and a little-known syndrome

Many people know that smoking tobacco can damage the lungs, but they assume that “natural” cannabis smoke is safer. In reality, burning any plant material produces harmful chemicals. Long-term smoking of cannabis is associated with chronic cough, bronchitis, and reduced lung function. For young adults, the damage may be invisible at first and only become clear later in life when normal aging of the lungs adds to earlier harm.

A more dramatic physical problem is Cannabinoid Hyperemesis Syndrome (CHS) CHS = a condition in regular cannabis users with severe nausea, stomach pain, and repeated vomiting. , which has now been officially recognized by the WHO with its own diagnosis code. CHS occurs mostly in long-term, frequent cannabis users and includes:

• Severe nausea and stomach pain
• Repeated vomiting, sometimes many times per hour
• Temporary relief from very hot showers or baths

Doctors report that normal anti-nausea medicines often do not work. Many patients move from hospital to hospital without receiving the correct diagnosis. In most cases, the only reliable treatment is to completely stop cannabis use. For some individuals, this is difficult because of dependence and social pressure.

5. Policy and ethics: who really benefits from “cannabis freedom”?

When politicians or business groups promote “cannabis liberalization” or “cannabis freedom,” they often focus on economic benefits, tourism, or tax revenue. They may use the language of “medical cannabis” to gain public support, while at the same time allowing products and marketing that clearly target young people and recreational users.

A responsible public-health policy must ask different questions:

• How will easier access to cannabis affect teenagers whose brains are still developing?
• Are there strong limits on THC concentration, packaging, and advertising?
• Is there honest education about risks, not only about potential medical uses?
• Who pays the long-term cost when more people develop dependence, mental-health problems, or CHS?

When these questions are ignored, cannabis policy can become a tool for private profit instead of a careful effort to protect public health and especially the next generation.

6. Conclusion: peace, health, and clear thinking

For the Education for Peace Foundation, “peace” is not only the absence of war. It also means protecting the minds and bodies of young people so they can grow into healthy, thoughtful, and responsible citizens. This includes honest discussion of drugs like cannabis.

The evidence is clear: cannabis is not a harmless toy. It can damage memory and learning, increase certain mental-health risks, harm the lungs, and in some cases cause serious conditions like CHS. These harms are strongest for young people and heavy, long-term users.

True compassion does not mean giving young people easy access to substances that quietly limit their future. Instead, it means giving them clear information, strong support, and real opportunities – so that they do not need to escape from life, but can build a better one.

Key Glossary

Comprehension Check – TOEFL-style Questions

References (for teachers and advanced students)

• Centers for Disease Control and Prevention (CDC). “Cannabis and Brain Health.” https://www.cdc.gov/cannabis/health-effects/brain-health.html
• Meier, M. H., et al. (2012). “Persistent cannabis users show neuropsychological decline from childhood to midlife.” Proceedings of the National Academy of Sciences.
• Harvard Health Publishing. “Cognitive effects of long-term cannabis use in midlife.” https://www.health.harvard.edu
• Cleveland Clinic. “Cannabis Hyperemesis Syndrome (CHS).” https://my.clevelandclinic.org/health/diseases/21665-cannabis-hyperemesis-syndrome
• World Health Organization. “International Classification of Diseases (ICD) – CHS code.”