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Coronary heart disease: epidemiology of smoking and intervention studies of smoking

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According to your 1990 abstract, people who don't use smokeless tobacco are extremely unlikely to get those white patches: "Of the 423 current smokeless tobacco users, 196 had leukoplakia compared to seven of the 493 nonusers (OR = 60.0, 95% CI = 40.5-88.8)." More recent work shows that smoking is not as much a concern as you claim

Retrieved June 24, 2013

Motivations for initiating All consumer nicotine gum survey respondents were asked about reasons for choosing to try the study product, with multiple responses permitted