We invite you to read more about secondhand and thirdhand smoke in regards to diabetes, heart disease, breast cancer, worker health, and even your pets. Secondhand smoke has a larger and more dangerous impact than many people realize. Secondhand Smoke and Diabetes Secondhand Smoke and Heart Disease Secondhand Smoke and Breast Cancer Secondhand Smoke and Pets Secondhand Smoke and Worker Health Thirdhand Smoke Outdoor Tobacco Smoke