Although the sensitivity analysis result indicates that the subgroups using objective diagnostic criteria remain statistically significant, their extremely small number remains a major limitation
Besides nicotine, e-cigarette aerosol can contain substances that harm the body, such as cancer-causing chemicals and tiny particles that reach deep into the lungs
They conclude that: The levels of ionic metals and metalloids, including chromium, nickel, and antimony, increased as the number of puffs increased, whereas concentrations of ionic zinc, copper, and lead were elevated at the start, and each device had different emissions
Surveillance is key Good monitoring tracks the extent and character of the tobacco epidemic and indicates how best to tailor policies
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