During adolescence, the brain is still immature, and is therefore more vulnerable. The earlier consumption begins, the more harmful the long-term effects are.
ALCOHOL
Some teenagers may consume large quantities of alcohol, a trend which is known as binge drinking. The immediate consequences may be very serious, with teenagers becoming comatose. In this case, they must receive emergency treatment in a hospital facility immediately.
This massive consumption of alcohol may result in the destruction of two to three times more neurons that in an adult and it affects the creation of new neurons. Furthermore, early access to alcohol, prior to becoming a young adult around the age of twenty, increases the risk of alcoholism by two.
TOBACCO
Tobacco consumption increases the risk of disease: cancer, chronic bronchitis and heart disease. These risks are very often ignored both by parents and by teenagers themselves, as they are only visible in the very long-term, several decades after smoking commences.
CANNABIS
Regular cannabis consumption slows the development of neurons, affects cognition (the ability to think and memorize) and as a result modifies academic performance, motivation, risk-taking and psychomotor skills. It also increases exposure to psychiatric disorders. Smoking cannabis increases the negative effects of other substances consumed such as alcohol or amphetamines and the consequences can be very severe if a person drives a car or a motorbike under the influence.
ADDICTIVE ACTIVITIES
Teenagers lose the idea of time and spend an inappropriate amount of time on this activity. They give up hobbies, their social relationships suffer, and some may even begin to truant from school. When teenagers are not able to engage in this activity, it is felt in their mood; they may be sad, defiant or even aggressive.