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Scientists arent completely sure why, but heres what they think: Smoking raises levels of a protein called SHBG (sex hormone-binding globulin)
Quality was evaluated by both the investigators using the Risk of Bias Assessment tool for Non-randomized Studies 14
A 2019 study found that the cotinine urine test could detect whether a person had smoked for at least 3 days after
[DOI] [PMC free article] [PubMed] [Google Scholar] 47.World Health Organization
Releases nicotine when in contact with saliva
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