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s2smodern
Sir, The suggestion by the science and technology committee for vaping to be permitted on buses and trains has hit the buffers of public opinion (report, Aug 17, and letters, Aug 20). Your letters column shows that the man or woman on the Clapham omnibus will not share air with nicotine-infused vapour, whatever the science says about the lack of harm.
There is another way to help smokers on public transport in their transition to safer nicotine without outraging non-smokers. It is for the government to end its 28-year-old ban on snus, the smokeless oral tobacco substitute that is the driving force behind smoking rates in Scandinavia being the lowest in Europe. Just 1 per cent of young Norwegian women now smoke. The health department is at war with science in its opposition to snus, which is safer than smoking. 
Gerry Stimson
Emeritus professor, Imperial College, London