I don't believe you. >SHS kills children and adults who don’t smoke. SHS causes disease in children and in adults who don’t smoke. Exposure to SHS while pregnant increases the chance that a woman will have a spontaneous abortion (miscarriage), stillborn birth, low birth-weight baby, and other pregnancy and delivery problems. Babies and children exposed to SHS are at an increased risk of sudden infant death syndrome (SIDS), upper respiratory and lung infections, ear infections, and more severe and frequent asthma attacks. Smoking by parents can cause wheezing, coughing, bronchitis, and pneumonia, and slow lung growth in their children. SHS immediately affects the heart, blood vessels and circulation in a harmful way. Over time it can cause heart disease, strokes, and heart attacks. SHS causes lung cancer in people who have never smoked. Even brief exposure can damage cells in ways that set the cancer process in motion. The Surgeon General estimates that living with a smoker increases the chance of getting lung cancer by 20% to 30%. Chemicals in tobacco smoke damage sperm, which might reduce fertility and harm fetal development. SHS is known to damage sperm in animals, but more studies are needed to find out its effects on humans. There is no safe level of exposure to SHS. Any exposure is harmful. Millions of Americans, both children and adults, are still exposed to SHS in their homes and workplaces despite a great deal of progress in tobacco control. In fact, almost half of non-smokers and more that 60% of children in the US continue to be exposed. On average, children are exposed to more SHS than non-smoking adults. The only way to fully protect non-smokers from exposure to SHS indoors is to prevent all smoking in that indoor space or building. Separating smokers from non-smokers, cleaning the air, and ventilating buildings cannot keep non-smokers from being exposed to SHS.

http://www.cancer.org/cancer/cancercauses/tobaccocancer/secondhand-smoke