Online survey of respondents aged 18 and over from English-speaking countries concerning their personality attributes, demographic information, and their use of legal and illegal drugs. Twelve personality attributes were measured by questionnaires including the NEO-FFI-R (neuroticism, extraversion, openness to experience, agreeableness, and conscientiousness), BIS-11 (impulsivity), and ImpSS (sensation seeking). Participants were questioned regarding their use of 18 legal and illegal drugs (alcohol, amphetamines, amyl nitrite, benzodiazepine, cannabis, chocolate, cocaine, caffeine, crack, ecstasy, heroin, ketamine, legal highs, LSD, methadone, mushrooms, nicotine, and volatile substance abuse) and one fictitious drug (Semeron) which was used to identify over-claimers. Demographic variables include level of education, age, gender, country of residence, and ethnicity.
