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They also show that there are more young people who are using them but who have never previously smoked, who, it is feared, may subsequently graduate to smoking, than there are ex-smokers using them. The campaign group, Action on Smoking and Health (Ash), estimates that 2 million people in Britain use electronic cigarettes, with about 700,000 using them instead of traditional cigarettes and the remainder using both.

Chest 112 , 14741479 (1997)

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Third, we analyzed the keywords in detail by searching which keywords were more specifically used by particular groups of participants, using the tf-idf (term frequency-inverse document frequency) analysis detailed in the Supplementary Material