Tobacco use, secondhand exposure and knowledge of secondhand and third-hand smoke among medical college students in Western Nepal: a cross-sectional study.

Tobacco use prevalence among the participants was found to be lower in comparison to other studies including medical students in several Asian countries. Despite more than three-fourths of students knowing the harmful effects of SHS exposure, almost one-half of them were exposed to SHS. The proportion of students who knew about THS exposure was comparably lower.