sentences:  Smoking has become less acceptable over recent years in a number of countries, a result of a number of the Framework Convention on Tobacco Control (FCTC) guidelines to reduce smoking prevalence.The renormalisation of smoking is a concern if e-cigarette use appears to become more appealing, for example through their use in locations where conventional cigarettes are prohibited, advertising and increased e-cigarette use by parents, siblings, peers, celebrities or other influential groups.Concerns have also been raised that non-tobacco nicotine use may results in uptake of tobacco smoking that would not otherwise have occurred.