It's a pity these people don't make more fuss about the drink drivers who kill innocent people walking or driving home or the junkies who break into your house or steal your car. According to a friend of ours who is a psychiatric nurse, over a third of her patients in the secure unit where she works are drug induced psychotics and another third are alcohol induced psychotics. These people are, to quote her, in that unit because they have comitted acts of "unprovoked, irrational and extreme violence". None of them, not unsurprisingly, carry out these acts because they have been smoking.