Below are some of the useful links on Cannabis use.
World Drug Report : 2016
Issues relating to Cannabis
Legalising in Canada - A UN report :
Synthetic Marijuana -
Drug Trends in Sweden 2017– Marijuana. http://www.can.se/contentassets/f07e89e00e1747e19e410262be17d954/drug-trends-in-sweden-2017.pdf
Looks at Alcohol , Tobacco and Illicit Drugs . ( looks at young people and also usage – with lowest rate of drug users but more consumption by those who use Marijuana
Cannabis and Cannabinoid Research