Abstract : I. 621 university students in Lebanon (429 males and 192 females), selected on the basis of every seventh student on the university register for 1972-73, were invited to participate in a drug use survey. The questionnaires were mailed to the students, followed by 2 reminders to the non-responders. 429 (69%) participated in the study. Only 17% had ever used marihuana, males showing a slightly higher frequency. 8% admitted to the use of amphetamines and 2% to using LSD. The rate of marihuana usage is much lower than that obtained in the U.S.A., but for amphetamines the rate is comparable. No significant relationship between use and marital status, nationality and the year at university was detected. Although expectation of further use of any of these drugs was found to be greater among users than non-users no definite plans were forthcoming. As in other studies, the users considered marihuana to be less harmful than non-users did. An interesting finding was the declared reasons for not using any of the above drugs. These were: disinterest, fear of health hazard and, thirdly, a desire to avoid illegal behaviour. Only 1 % of the students gave non-accessibility as the reason for non-use. With regard to attitude to legal control, the majority of non-users thought that possession of marihuana should be prohibited, and most of the users thought that there should be controls on its possession and distribution.