Heroin is one of the most addictive drugs in the world. It is an opioid that floods the brain with dopamine, a chemical that helps us feel pleasure. This causes a strong feeling of happiness, ...

Caffeine is the world’s most commonly abused brain stimulant. Daily caffeine consumption by adolescents (ages 9 to 17 yrs) has been rapidly increasing most often in the form of soda, energy drinks and ...

Long-term abuse of cocaine induces compensatory changes in numerous genes associated with brain function. These compensatory changes lead to the appearance of the classic series of withdrawal symptoms ...