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Comparing cannabis with tobacco: Arithmetic does not add up

BMJ 2003; 327 doi: (Published 17 July 2003) Cite this as: BMJ 2003;327:165
  1. Les Iversen (, professor
  1. Department of Pharmacology, University of Oxford, Oxford OX1 3QT

    EDITOR—The editorial by Henry et al comparing cannabis with tobacco implies that in the future as many as 30 000 deaths a year in Britain may be caused by smoking cannabis.1 But this conclusion seems to have been based on a series of questionable assumptions.

    To expose the lungs to the same amount of …

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