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Their claim

DNA methylation could be an important sign that reveals an individuals smoking history, and could provide researchers with potential targets for new therapies, the researchers said

Dr Jaskirt Matharu Medical Scientist, License for Doctor of Medicine (The Swedish National Board of Health and Welfare)

Instead of cigarettes, my new drug of choice became junk food and Netflix
So, people start asking, Does a 10 panel drug test test for nicotine? Its a more advanced screening than the others

Strengths of our study include the fact that it is a large, population-based analysis that used reliable, nationwide data