I can understand that now. I didn't see the little source disclaimer at the bottom right away, and didnt take into account that meth is pretty rare over there.Bear in mind that it is in the uk and it is harm to society. Given the low rate of meth use here (UK) compared to cannabis, the harm to society is probably worse from cannabis - cancer, psychosis ect. Harm to self is the point of this thread anyway. Perhaps not entirely appropriate graph for this I'll give you that.
^^^ that chart is misleading. Marijuana makes you hurt more people then meth would? I don't think so...
David Nutt did a study(s) on harm to self and society. Here is a nice graph from it
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So by his metrics mushrooms for the win.