Surgeon General has warned that were in the midst of a youth vaping epidemic," Herrera added
The discrepancy in these studies may be caused by residual confounding (e.g., weight gain after starting dipping snus since snus is often used to quit smoking), varying ways of treating smoking status (adjusting for it as confounders or restricting analysis to never smokers), different baseline age, inadequate statistical power, and diverse effects of snus (nicotine) on different cardiovascular diseases
But that is not how it has worked in practice
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, propylene glycol, vegetable glycerin, and/or polyethylene glycol 400), and variable concentrations of nicotine [39]