"E-cigarettes are estimated to have helped 16,000-22,000 smokers in England to quit in 2014.
Previous research has found that when used in this way, e-cigarettes increase the chances of success by around 50% compared with using no support or one of the traditional nicotine products such as gum or skin patch bought from a shop.2,3 This raises the long-term success rates from around 5% to around 7½%. The increased success rate amounts to an additional 22K people stopping who would otherwise have continued smoking. Some of these people may have used an e-cigarette instead of one of the more established aids to cessation such as the Stop-Smoking Services. Adjusting for this, the number helped by e-cigarettes may be somewhat lower, at 16K.
Professor Robert West, who led the research team, said "E-cigarettes appear to be helping a significant number of smokers to stop who would not have done otherwise – not as many as some e-cigarette enthusiasts claim, but a substantial number nonetheless."