Effects of passive smoking on students at College of Applied Medical Sciences, King Saud Bin Abdulaziz University for Health Sciences, Riyadh.

Background: Despite the recent campaigns to eliminate smoking, the rates are still increasing world-wide. Exposure to passive smoking (PS) is associated with morbidity and mortality from awful diseases. Although many college students smoke, little is known about their exposure to PS, common places and sources of exposures in Saudi Arabia.