The drugs that kill the most people in England and Wales also happen to be legal, according to the latest data available.
This chart from Statista - taking inspiration from a similar chart by Vox in the US - shows tobacco, alcohol and prescription drugs were responsible for far more deaths than any illegal drugs.
Two caveats: the figures here show overall deaths and do not take into account the rate - i.e. number of deaths in proportion to the number of users of certain drugs. Equally the figures are not from the same year - all are from 2013 except alcohol which is from 2012.