For aim 1, separate linear regression models were conducted for each biomarker (using log-transformed values) to examine differences based on smoking and vaping status in the past 7 days (no use, exclusive vaping, exclusive smoking, dual use
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101 Another study found that greater tobacco outlet density in youth activity spaces (not home or school environments) was positively associated with smoking among young people
The section also outlines the gaps in the literature and the contribution of our study to fill these gaps
It is highly unlikely that the product has any environmental risk, given that the producers have described their studies to examine the relevant questions/issues that are considered by the USDA and the EPA, said Roger Beachy, of Washington University in St