Electronic cigarettes for smoking cessation

[1 ]Nuffield Department of Primary Care Health Sciences; University of Oxford; Oxford UK

[2 ]National Drug and Alcohol Research Centre; University of New South Wales; Sydney Australia

[3 ]National Institute for Health Innovation; University of Auckland; Auckland New Zealand

[4 ]Norwich Medical School; University of East Anglia; Norwich UK

[5 ]Tobacco Research and Treatment Center, Department of Medicine; Massachusetts General Hospital and Harvard Medical School; Boston Massachusetts USA

[6 ]Cochrane Australia; School of Public Health & Preventive Medicine, Monash University; Melbourne Australia

[7 ]Wolfson Institute of Preventive Medicine; Barts & The London School of Medicine and Dentistry, Queen Mary University of London; London UK