There is some info here which should help answer your question: http://www.nspcc.org.uk/news-and-views/media-centre/key-information-for-journalists/facts-and-figures/Facts-and-figures_wda73664.html
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Very little. Prescription and OTC drugs kill more people every year then all illegal drugs combined. Alcohol on the other hand kills just about as much if not more.
Just some fun facts
Deaths linked to cannabis use: 0
Deaths linked to magic mushrooms: 0
Deaths linked to LSD: 0