Related by context. Frequent words. (Click for all words.) 67 secondhand smoke 64 Cigarette smoking 58 passive smoking 56 Lung cancer 56 Carbon monoxide 54 Cardiovascular disease 54 Smoking 54 Childhood obesity 53 Sleep deprivation 53 Sleep apnea 53 Binge drinking 53 Colorectal cancer 52 Ovarian cancer 51 Mental illness 51 cigarette smoke 50 carcinogen 50 Lead poisoning 49 Underage drinking 49 cigarette smoking 49 carcinogens 49 nonsmokers 48 Cervical cancer 48 Trans fat 48 pollutant 48 Whooping cough 48 air pollution 48 Atrial fibrillation 47 Breast cancer 47 Obesity 47 particulate pollution 46 Vitamin D deficiency 46 smokers 45 Pancreatic cancer 45 Eating disorders 45 Bipolar disorder 45 carcinogenic 44 Prostate cancer 44 Nicotine 44 radon 44 Carbon dioxide 44 smoking 44 diesel fumes 44 asbestos exposure 44 neurotoxin 44 PM#.# 44 heart disease 44 PFOA 43 Breast feeding 43 human carcinogen 43 Radon 43 Global warming 43 chronic bronchitis 43 diesel exhaust 43 Fluoride 43 gum disease 43 Chlamydia 43 nonsmoker 43 Cystic fibrosis 42 COPD 42 Prescription drugs 42 Left untreated 42 Pertussis 42 lung diseases 42 Formaldehyde 42 phthalates 42 Trans fats 42 cardiovascular disease 42 disease COPD 42 Acetaminophen 42 obesity 41 Malnutrition 41 preventable 41 Seasonal flu 41 lung disease 41 Multiple sclerosis 41 Snoring 41 cigarette smokers 41 fine particulate matter 41 banning smoking 41 cardiovascular disease CVD 41 Pollution 40 prematurity 40 asthma 40 toxins 40 Bisphenol 40 particulate matter 40 Alcohol 40 pollutants 40 asthma sufferers 40 nicotine 40 Substance abuse 40 Pneumonia 40 physical inactivity 40 carbon monoxide 40 nicotine addiction 40 Cadmium 40 Aspartame 40 tooth decay 40 particulates 39 smoker 39 NAFLD