The most common drugs amongst adolescents in Iran were hallucinogens, sleeping pills and tranquilizers as well as hookah.
A diverse pattern of tobacco smoking, alcohol drinking and drug use among adolescents in Iran was verified.
The risk of smoking, drinking and drug use by boys was considerably greater than girls.
Data showed a varying trend of drug use over the three periods of times studied.
Preventive and control measures provided in schools should be compatible with age groups.