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Tom McLean, chief scientific advisor to The Nanotera Group, said “respiratory droplets” contained in the haze created by those using e-cigarettes and vaporizers could lead to the Covid-19 strain of the condition being unintentionally spread.

Mr McLean also said there was evidence that the properties of the vapour caused a weakened immune system - despite ex-smokers often turning to the devices as a ‘safer’ option.