Summary of lifetime use of cannabis and stimulants in the ecstasy (E), amphetamine (A), and cannabis (C) groups.

Single subject data are presented (number of times used) and the mean±standard deviation for each group. The term ‘amphetamine’ describes amphetamine and amphetamine-like drugs such methamphetamine, cocaine, dexamphetamine, and methylphenidate. The term ‘ecstasy’ describes ecstasy and MDA (3,4-methylenedioxyamphetamine, 2 subjects).