The THC in hashish interferes with a part of the brain called the basal ganglia which is involved in movement control.
Nearly 1 million people each year become first time users of Ecstasy.
Doctors argue whether the withdrawal syndrome leaves individuals who take sleeping medication worse than they would be without the drug, but evidence suggests that it often does.
Students spend $5 billion per year on alcohol; more than they spend on sodas, tea, coffee or books combined.