Adolescence is the phase of life between childhood and adulthood, usually occurring between ages 12 and 19, where the body undergoes rapid physical and mental changes.

The Vulnerable Brain

During these years, the brain is still building vital connections. The prefrontal cortex, the part of the brain responsible for decision-making and impulse control, is not fully developed until the mid-twenties. Because this area is still under construction, adolescents are more likely to take risks and experiment with substances like alcohol, tobacco, or drugs. These substances interfere with the brain's reward system, which releases a chemical called dopamine that makes us feel pleasure.

How Substance Abuse Affects the Body

Substance abuse refers to the harmful or hazardous use of psychoactive substances, including alcohol and illicit drugs. When these substances enter the body, they disrupt the normal functioning of the nervous system. Common physical effects include:

• Increased heart rate and blood pressure.
• Damage to the liver, which is responsible for filtering toxins from the blood.
• Weakened immune system, making the body more prone to infections.
• Short-term memory loss and difficulty concentrating in school.

The Cycle of Addiction

Addiction is a chronic disease that causes a person to seek out substances despite harmful consequences. It works by "hijacking" the brain. When someone uses a drug, the brain is flooded with dopamine. Over time, the brain adjusts to these high levels of dopamine by producing less of it on its own. This means the person needs more of the substance just to feel "normal." This process is called tolerance. Withdrawal symptoms occur when the substance is stopped, causing the person to feel sick, anxious, or irritable, which makes it very difficult to quit.

Recognizing the Risks

The earlier an adolescent starts using substances, the higher the risk of developing a lifelong addiction. Peer pressure, stress, and curiosity are common triggers. Understanding that the body is in a sensitive growth phase helps explain why avoiding drugs is essential for healthy development. Healthy habits like exercise, good nutrition, and open communication with trusted adults help strengthen the brain and protect it from the urge to experiment with harmful substances.