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Table 2 Geometric mean and median of level of urine cotinine in the non-, electronic-, and conventional smokers, and dual users (ng/mL) Additionally, we performed an analysis of covariance (ANCOVA) to confirm whether these differences in UC concentration were statistically significant

A longitudinal study of predictors for adolescent electronic cigarette experimentation and comparison with conventional smoking

Both methods produce aromatic smoke that masks cigarette odor rather than fully eliminating it

They were also given the opportunity to provide comments in a free-response format

Medications Some drugs affect blood clotting ability