As 'this weeks studies' have shown,Cannabis can be mentally damaging to 'some' folk, which is half the reason i can't see it being legalised in the UK for anyone except the odd medical user perhaps.
"Weed" is probably the most commonly used "illicit drug" in the UK and this has bred a extremely large industry of illegal and criminal activity that could easily be curtailed by allowing regulated sales and responsible use.....its a no brainer surely
