the participant had used an illicit drug other than cannabis, including cocaine, stimulants, sedatives, opiates, solvents, hallucinogens, phencyclidine (PCP) or other illicit drugs, even once in their lifetime.(h) Drug problems: A dichotomous item assessing severe liability to drug abuse/dependence was coded positively if the respondent said that they had: ‘... ever discussed any other drug problem with any professional’ or if they had ‘... ever been treated for a drug problem’.
