Protective cells in the lungs of ex smokers could explain why quitting smoking reduces the risk of developing lung cancer later in life. Stopping smoking completely is the best thing you can do E cigarettes may be helping thousands a year to quit smoking, but Stop Smoking Services are still the best option Evidence update on the cancer risk of vaping e cigarettes: A systematic review More e cigarette users than cigarette smokers for the first time in the UK The Lancet Oncology Health professionals reluctant to recommend e cigarettes to cancer patients Dentistry.co.uk Smoking rates halve since 1970s in Britain