We are human and will inevitably fall short of the official advice. So just as we encourage teenagers to use contraception, we should make it easier for adults to switch to safer (but not risk-free) alternatives. Public Health England have to their credit highlighted the relative benefits of vaping by pointing out that it’s at least 95 per cent safer than smoking. In other words, it would take 20 non-smokers to take up vaping to outweigh the good of one smoker switching the other way.