Second-hand smoke refers to being exposed to the harmful effects of tobacco because someone is smoking near you. It includes the smoke the person has breathed out (exhaled smoke) and also smoke from the burning cigarette.
In Aotearoa New Zealand, second-hand smoke is the greatest cause of death from something in the environment. There is no safe amount of exposure to second-hand smoke. People who are exposed to second-hand smoke can suffer many of the same diseases that smokers get, such as lung cancer, coronary heart disease, nasal sinus cancer and stroke.