The Dangers of Secondhand & Thirdhand Smoke Exposure Asthma and Allergy Foundation Tobacco can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping is Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Secondhand Smoke Second hand E cigarette Vapour Increases Risk Of Poor Respiratory Health Study Finds Cigarette Smoke Detector