a sample survey of nigerian students conducted by means of a self-administered drug use questionnaire at three universities in the united states of america showed that at some time in their lives 91.2 per cent of the respondents had used alcoholic beverages , 62.3 per cent tobacco , 30.6 per cent cannabis , 6.3 per cent inhalants , 19.7 per cent amphetamines or amphetamine-type substances , 4.6 per cent cocaine , 2.1 per cent hallucinogens , 23.8 per cent tranquillizers , 4.2 per cent sedatives , 4.2 per cent opium , 1.3 per cent heroin and 20.5 per cent other opiates .
C0002667
amphetamines
C0002658
amphetamine