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Health experts have highlighted the benefits of reducing tobacco smoking with the use of e-cigarettes. [...] Alan R Boobis of the Imperial College London, said the liquid in e‐cigarettes, propylene glycol and/or vegetable glycerine(glycerol) was relatively non‐toxic at the levels present when inhaled over the short to medium term.

He advocated the consumption of electronic cigarettes which was considered safer than the conventional cigarettes.
This, he said, applies to both absolute and relative risk, in users and in bystanders.