5. The right answer is tolerance.
In neuroscience, tolerance is defined as a reduction in the effect of a drug on the brain following previous exposure.
The development of tolerance is a risk factor for addiction because it leads the individual to increase his consumption in order to obtain the desired effect.
6. The right answer is withdrawal.
When stopping or drastically reducing excessive and prolonged consumption of alcohol, withdrawal symptoms may occur. Their severity and duration can vary greatly, from the banal "hangover" to a deadly delirium tremens.
It is impossible to predict the evolution of the withdrawal. A doctor may also prescribe supportive treatment, which alleviates the symptoms of withdrawal and limits the risks.
7. The right answer is nicotine.
Nicotine is a drug, it is a "reinforcement" drug, that is, smokers want any side effects.
It causes chemical and biological changes in the brain. We talk about psychoactive effect.
It is responsible for a nicotine addiction that is above all a physical dependence considered important.
Withdrawal symptoms are severe and most smokers fail to quit on their first attempt because of the strength of this addiction.
8. The right answer is oral cancers.
Smoking is a proven human carcinogen (IARC Group 1): it is the leading cause of cancer in the world.
Tobacco is the leading risk factor for lung cancer (a 10 to 15-fold risk to a smoker) and bladder cancer. There is also sufficient evidence of carcinogenicity in humans between smoking and cancers of the oral cavity, oro-, rhino- and hypopharynx.