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Most cancers have unique pathways leading to their progression, but nicotine contributes to both the development and progression of different cancers in several ways

"The vast majority of smokers start when they are young, and three-quarters say that if they could turn back the clock they would not have started," she said

Smoking status was determined based on current and past smoking habits, while sociodemographic characteristics included gender, age, and occupational social grade

Nicotine Tob Res 26(10):13131321 Cobb CO, Shihadeh A, Weaver MF, Eissenberg T (2011) Waterpipe tobacco smoking and cigarette smoking: a direct comparison of toxicant exposure and subjective effects