Can Fam Physician. 1982 Feb;28:299-302.
Non-smokers are exposed to three types of cigaret smoke: mainstream, sidestream and diffusional smoke, of which sidestream (produced while the cigaret smolders in an ashtray) is the most toxic. Studies of passive smoking show that while smoke is an unpleasant irritant, it appears to have no lasting effects on healthy passive smokers. It may, however, be a particular irritant to already sensitive individuals such as asthmatics, and to young children chronically exposed. Such children show an increase of respiratory disorders, and adults show an increase of small airway disease with a possible risk of lung cancer. More stringent legislation on smoking is desirable.
主流烟、侧流烟和扩散烟，其中侧流烟（在香烟在烟灰缸闷烧时产生）毒性最大。被动吸烟研究表明，虽然烟雾是一种令人不快的刺激物，但它似乎对健康的被动吸烟者没有持久影响。然而，它可能对已经敏感的个体，如哮喘患者，以及长期接触的幼儿，是一种特别的刺激物。这些儿童会出现呼吸道疾病增多的情况，而成年人则会出现小气道疾病增多的情况，可能有患肺癌的风险。需要对吸烟实施更严格的立法。
