Smoking can be dangerous not only for the smoker, but also for those around the smoker. Secondhand smoke is the third leading cause of preventable death (after active smoking and alcohol), according to the Manitoba Medical Association. They also say that the smoke contains over 4,000 chemicals, 50 of which are known to be cancer-related. Secondhand smoke has been linked to heart and respiratory disease; lung, breast, cervical, and nasal sinus cancers; strokes and miscarriages. In children, dangers include sudden infant death syndrome, fetal growth impairment, bronchitis, pneumonia, asthma and middle-ear disease. People who smoke subject themselves to deadly diseases, as well as long- and short-term health problems. Non-smokers should not have to live with the consequences of smokers' actions.