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Mainly used to make cigarette tobacco leaf blends a bit stronger, the Burley Whole Leaf Tobacco is also used for cigar filler, pipe blends, and chewing tobacco leaf

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

Original price was: $19.50.Current price is: $15.50

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