Related by context. Frequent words. (Click for all words.) 67 Secondhand Smoke 66 Toxic Chemicals 60 Gum Disease 60 Quitting Smoking 60 secondhand tobacco 59 Carcinogens 59 Ear Infections 58 Preterm Birth 58 Radiation Exposure 58 Smoking Bans 58 Increases Risk 58 Growing Problem 57 Racial Disparities 57 Alcohol Consumption 57 Childhood Asthma 57 Greenhouse Gases 56 Silent Killer 56 Birth Weight 56 Breast Cancer Risk 56 Reduces Risk 56 Hormone Therapy 56 Methylmercury 56 Systematic Review 55 Related Deaths 55 Venous Thromboembolism 55 Brain Tumors 55 Air Pollutants 55 Sleep Deprivation 55 Cardiovascular Events 55 Meta Analysis 55 Antibiotic Resistance 55 Brain Cells 55 Reduce Risk 55 Lead Poisoning 55 Drug Resistant 55 Harmful 54 Stroke Risk 54 Sleep Problems 54 Eating Habits 54 Related Problems 54 Postpartum Depression 54 Pollutant 54 passive smoking 54 Experts Urge 53 Homocysteine 53 Cervical Cancer Vaccine 53 Holds Promise 53 Increased Risk 53 Binge Drinking 53 secondhand smoke 53 Blood Clots 53 Head Lice 53 Obesity Epidemic 53 Postmenopausal Women 52 Carbon Monoxide Poisoning 52 Susceptibility 52 secondhand smoke exposure 52 Kidney Stones 52 polycyclic aromatic hydrocarbons PAHs 52 Substance Use 52 Drinking Age 52 Staying Healthy 52 Smallpox Vaccine 52 Healthbeat 52 Insulin Resistance 52 Cold Medicines 52 Heart Attacks 52 Genetic Testing 52 Heart Disease 51 Study Suggests 51 Treatable 51 Blood Vessels 51 endocrine disrupting chemicals 51 Carbon Monoxide 51 Be Treated 51 Helps Prevent 51 Study Confirms 51 Cardiovascular Risk 51 Study Links 51 Acrylamide 51 Help Prevent 51 Healthy Diet 51 Belly Fat 51 Misdiagnosis 51 Safe Cigarettes 51 methyl mercury 51 Atopic Dermatitis 51 Lung Disease 51 Secondhand smoke 51 Depleted Uranium 51 Trans Fats 51 Neck Pain 51 Study Examines 51 Cancer Treatments 50 Diabetic Patients 50 Prostate Cancer Patients 50 Protect Against 50 Than Thought 50 reproductive toxicity 50 Esophageal Cancer 50 Particulate Matter