sentences:  This ‘gateway theory’ has been largely applied to the use of e-cigarettes by non-smokers and particularly children.There is no reported evidence, however, that NRT use among young people has ever acted as a gateway to smoking, or that e-cigarette use has resulted in any appreciable increase initiation of smoking among children or adults.The Royal College of Physicians suggest that any association between e-cigarette and conventional cigarette use is likely due to common liability to use these products and the use of e-cigarettes to reduce smoking.