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A report from the Royal College of Physicians published last month said: "Although no study so far shows any clear hazards of flavours in e-cigarette vapour, those derived from flavours seem the most likely to pose appreciable health risks from long-term use." "We need to keep an eye on the products and how they're made, and if we can make them even less harmful," said McNeil

NCIs Smokefree.gov, for example, offers a suite of smoking cessation resources, such as text messaging programs that offer 24/7 support and articles on how to handle the challenges of quitting smoking

Jinsong Zhang and Qizhan Liu participated in experimental design and coordination and helped to revise the manuscript

This also means strengthening tobacco tax administration (licensing, warehousing, anti-forestalling, fiscal markings, and enforcement), considering dedicating tobacco tax revenues to tobacco control programmes, and prohibiting or restricting tax/duty-free sales of tobacco products