Vaping at a young age may act as a gateway to smoking, review suggests LSHTM As National Sales of E Cigarettes Climb, Report Shows that State Restrictions on Flavored Products Are Critical to Protect Young People CDC Foundation Latest Cochrane Review finds high certainty evidence that nicotine e cigarettes are more effective than traditional nicotine replacement therapy (NRT) in helping people quit smoking Cochrane A systematic review of the effects of e cigarette use on lung function npj Primary Care Respiratory Medicine