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Lets pay it forward and discuss the Cotinine test for those that may not know much about it
J Natl Cancer Inst 104(7):541548 Klemperer EM et al (2021) Tobacco and nicotine use among US adult Never Smokers in wave 4 (20162018) of the population assessment of tobacco and health study
Most smokeless tobacco users put products behind their lower lip a practice that generates tobacco juice and leads to spitting
showed that smokers are at almost 10-fold elevated risk of developing lung cancer compared to never smokers in Caucasians, and 10-fold increase in African-Americans [66]
Burn marks and lip burns from smoking Many smokers notice darker spots or marks on their lips that are not the diffuse pigmentation of smoker's melanosis but localized brown or grey patches at specific points
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