We look at how other countries around the world deal with the possession and use of cannabis.
So where in the world is it legal to smoke marijuana?
Colombia: Small amounts of up to 22 grams are OK for personal consumption. However, selling it remains illegal. You are allowed to grow up to 20 plants for personal use.
Costa Rica: It’s a bit of a grey area. Cannabis is illegal but there’s widespread smoking throughout the country. Police officers do not arrest people carrying enough for personal consumption, yet no amount has been outlined as a minimum for possession.
Czech republic: Possession of up to 15 grams for personal use or growing up to five plants is a police caution. Medical use of the drug on prescription has been legal since April 2013.
Ecuador: Having a small stash of under 10 grams for personal use is legal.
Jamaica: Growing, selling and using cannabis is illegal. However, the government passed a motion in 2013 to decriminalize the drug if a person was found with a small amount.
Netherlands: Cannabis products are only sold in “coffee shops” and possession of up to 5 grams for personal use is OK. Other types of sales and transportation are illegal.
Norway: It’s legal to have up to 15 grams for personal use. Anything over that is punished with a fine of 1,500-15,000 kroner (£139-£1,396) in the case of first-time offenders; possessing more is considered dealing and punished more harshly.
Peru: Possession of under eight grams is considered legal for personal use.
Portugal: It became the first country in the world in 2001 to legalize the use of all drugs, and started treating drug users as sick people, instead of criminals. However, you can be arrested or made to go into rehab if caught several times in possession.
Romania: Medical use is legal under certain conditions.
Spain: Growing the plant on private property for personal use, and consumption by adults in a private space, is legal. But buying or selling any quantity of cannabis is a criminal offence. Possession and consumption in a public place is illegal and punishable by a fine.
Switzerland: Growing up to four plants is legal. But sale or transport is illegal.
Uruguay: A law has been passed legalizing cannabis but won’t into come into effect until 2015. The new law says that buyers must be 18 or older, residents of Uruguay, and must register with the authorities. Authorities will grow the cannabis that can be sold legal.
USA: Colorado and Washington state have legalized marijuana for recreational use, while some of the other states permit medical marijuana.
UK: It is illegal to possess cannabis.