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9092 There is strong evidence from multiple studies to suggest that PAH and N-nitrosamines are involved in lung carcinogenesis

"You can't grow a crop of all top-tier leaves because you're going to have leaves from the middle and bottom tiers on those plants as well, so there's only so much of any particular grade you can produce at a time." Turkish tobacco is also hard to source for use in pipe-tobacco blends specifically

(Atlanta, GA: US Department of Health and Human Services, Centers for Disease 2006)

Consequently, the popularity of this product has waned, with consumption declining gradually over the past century, dropping by about 44% in just the last 15 years [39]