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Yibai Li, Ph.D

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tobacco smoke," Joel Nitzkin, an American physician and tobacco policy adviser, told AFP."E-cigarettes should be considered 'recreational' alternatives to cigarettes for people who have the urge to smoke but would rather not expose themselves and those around them to the many harmful chemicals in cigarette smoke."Researcher Gerry Stimson of London's Imperial College and Clive Bates, a former director of UK-based Action on Smoking and Health, in a study last month described the e-cig as "a very low risk alternative to cigarettes, used by smokers as a pleasurable way of taking the relatively harmless recreational drug nicotine".'Vaping': A legal hazeRegulations on e-cigarettes differ, though, between countries