The social and economic consequences of legalising recreational cannabis use in Switzerland.
This pilot trial will compare the behaviour of participants who are able to obtain cannabis legally through the trial with participants in a control group who continue to purchase cannabis on the black market. The aim of the pilot trial in the canton of Zurich is to investigate the social and economic consequences of legalising recreational cannabis use in Switzerland. In addition, the effects of a self-regulation programme for the prevention of excessive cannabis use are to be studied. This involves a randomised controlled trial (RCT).