The United States
Cannabis use for medical purposes legalized in New Hampshire, Vermont, New York, Pennsylvania, New Jersey, Rhode Island, Connecticut, Maryland, Ohio, Michigan, Illinois, Arkansas, Louisiana, Florida, Minnesota, North Dakota, Montana, New Mexico, Arizona, Delaware, Hawaii, Puerto Rico.
The Dutch policy allows citizens to own small amounts of weed and cultivate a few cannabis plants. The maximum amount of weed you can carry is five grams (0.2 ounces) and you can grow no more than five cannabis plants.
Selling weed in coffee shops remains technically illegal, but is tolerated by police and prosecutors so long as owners stick to the rules. No selling "hard drugs" like heroin, cocaine, ecstasy and amphetamines. Do not cause a nuisance in the neighbourhood. Do not sell weed to minors -- that's under-18-year-olds. Do not sell more than five grams (0.2 ounces) at a time. Do not advertise your coffee shop.
Selling cannabis is a criminal offense punishable by law regardless of the quantity. But personal cultivation and use, and other purposes other than sale or trade is decriminalised. Growing the plant on private property for personal use, and consumption by adults in a private space is legal. Using the legal gray areas in Spanish legislation, cannabis clubs are a popular way for enthusiasts to obtain and use cannabis as a technically-legal private collective.
Uruguay has never criminalized personal possession of drugs, and a 1974 law allowed judges to determine whether a given case of possession was personal or commercial. This law was later updated in 1998. Possession for personal use is not penalized and the law does not specify quantity for "personal amount".
In August 2014, Uruguay legalized growing up to six plants at home, as well as the formation of growing clubs, a state-controlled marijuana dispensary regime, and the creation of a Cannabis regulatory institute (IRCA in Spanish). In October 2014 the Government began registering growers' clubs, allowed in turn to grow a maximum of 99 cannabis plants annually.
As of 2015, the marijuana dispensary business (including medical use) has not been implemented, while as of August 2015, there were 2743 registered personal growers.
Recently, the Latin American nation also legalized the sale of recreational pot in pharmacies, making it the first country ever to move cannabis via drug store retail.