Loading...
The health effects of e-cigarettes are not yet clear. Investigators in Hong Kong studied the respiratory effects of e-cigarettes in 45,000 adolescents (mean age, 14.6 years; 51% male) who completed anonymous in-school surveys on tobacco and e-cigarette use. Students were classified with regard to tobacco smoking as follows: never, experimental (once or a few times), ex-, or current. They also indicated whether they had used e-cigarettes in the past 30 days and whether or not they had respiratory symptoms (cough/phlegm) for ≥3 consecutive months in the past 12 months.
In analyses adjusted for sex, age, perceived family affluence, secondhand smoke exposure, and school clustering, never-smokers (adjusted odds ratio, 2.06), ever-smokers (AOR, 1.…