There's a huge carbon footprint on cannabis, certainly. It's either come a long way or, more common these days, is grown in the UK using phenomenally power-hungry set-ups.
Cocaine seemingly stands way above the rest. It's responsible for huge deforestation. The American-funded herbicide sprays can't be used in areas covered by national park. So the growers have moved into there and cleared the trees.
The Independent did one of their front page splashes on it three years ago
http://www.independent.co.uk/news/world/americas/colombia-the-real-victim-in-failed-war-on-drugs-473931.html
And George Monbiot did a piece about it last week
http://www.monbiot.com/archives/2009/06/30/help-addicts-but-lock-up-the-casual-users-of-cocaine/
Or, as the vice president of Colombia asserts, 'Every time you consume one gram of cocaine, you are destroying 4.4 square metres of Colombian rainforest'
http://www.independent.co.uk/news/world/americas/colombian-vps-stark-message-for-britains-middleclass-drug-users-1024613.html
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