Despite being obsessively anti-smoking during their childhood, 2 of my kids took up smoking at 18. They both now use the e-cigs and I feel happier about this than the ordinary fags because they are inhaling vapour and nicotine and not all the noxious substances in cigarettes. Some of the e-cigs can be flavoured with mint and other essences. Since these flavouring chemicals are also burnt I would welcome research as to whether carcinogens are produced in this way. The dosage of nicotine can be controlled in the e-cig by using different strengths of nicotine 'juice' I am reliably informed. It would be inadvisable for pregnant women to use any nicotine product since blood vesels are narrowed by its action and the placenta could be compromised