This study is concerned with the personal, social and public health dimensions of drug and alcohol use, including the use of ecstasy and amphetamines.  Amphetamine-type stimulants include amphetamines, methamphetamines, ecstasy and MDMA.  Amphetamines occur in various forms (e.g. amphetamine sulphate, dexamphetamine, methamphetamine) and are known by various names (e.g. speed, base, ice, shabu, wizz). Their chemical structure and effects differ from other potent stimulants such as cocaine and ecstasy (MDMA).