US
Participants provided information about how frequently they had used marijuana and other drugs over a period of years
Los Angeles is considered the world's largest pot market
Growing, dealing and consumption of cannabis for recreational purposes is illegal in Zambia
Several nations have embraced use of medicinal cannabis including Canada, Australia, Israel, and many states in US
Thailand legalised marijuana on Tuesday in a landmark decision for a region with some of the harshest drug laws
Will be held during 2020 elections
Canada legalised recreational marijuana use on Oct 17
Statistics Canada says 5.4 million Canadians will buy cannabis from legal dispensaries in 2018
Pot stocks soar on the Toronto and New York stock exchanges
Canada became the first major Western nation to legalise and regulate its sale and recreational use