Cannabis is illegal to possess and cultivate in most countries. However, recent research into its medical benefits have revealed it is a relatively benign and mostly harmless substance. Many countries, including the UK, Portugal and Canada, are re-evaluating the plant's legal status.

in the UK
On the 29th January 2004, cannabis was reclassified from a class B to a Class C drug. Class C is reserved for substances with an accepted medical use, such as steroids, anti-depressants, and some tranquillisers.

Note: it's still illegal to possess or cultivate the plants. However, if you're caught with cannabis, police can give you an official warning, rather than cautioning or charging you with an offence.

You can be arrested if:

• you are publicly smoking
• you've previously offended or been given a warning
• you are aged 17 or under
• you are close to schools or other 'youth premises'
• you are wearing a "High Times" T-shirt and a tall stripey rasta hat

Okay, not the last one. The maximum penalty is now two years instead of five.

in the US
Meanwhile, cannabis remains a Schedule I drug in the United States, along with LSD and heroin, carrying the severest federal penalties for possession and supply.