Re: Should the supply of cannabis be legalised now?
A systematic review and meta-analysis of clinical studies revealed that cannabis use shrinks brain regions involved in reward, learning and memory. 
Another systematic review and meta-analysis of clinical studies revealed that cannabis use in adolescence increased depression in young adulthood 37% and suicide attempts by 346% 
In Canada 30,000 medical doctors were officially informed that medicinal cannabis use does more harm than good. 
Another meta-analysis revealed that cannabis use by people with mental disorders increased violence 3 times. 
Competing interests: No competing interests