penn state e cigarette dependence index Prevalence of use, perceptions of harm and addictiveness, and of electronic cigarettes among adults in Kuwait: A cross-sectional study Frontiers | Prevalence, knowledge, attitude,
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PMCID: PMC3995271

NNN is a likely cause of cancer in the nose, mouth and oesophagus of smokers, and other N -nitrosamines are likely causes of nasal, oesophagus and liver cancers

Smoking breaks the fast because the smoke contains particles that can reach the stomach
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