Related by context. Frequent words. (Click for all words.) 69 cigarette smoke 67 nonsmokers 63 cigarette smoking 62 smoking 59 smokers 58 smoking bans 56 carcinogens 56 smoking ban 55 air pollution 55 smoke 55 nonsmoking 53 carcinogen 53 radon 51 Smoking 49 smoker 49 carbon monoxide 48 pollutants 48 nicotine 47 particulate matter 47 toxic chemicals 47 trans fats 46 Tobacco Free 46 tobacco 45 lung cancer 45 toxins 45 smokeless tobacco 45 lung disease 44 carcinogenic 44 phthalates 44 pollution 44 pollutant 44 harmful effects 44 radiation exposure 43 asbestos 42 Tobacco Control 42 Lung Association 42 Smokers 41 mercury emissions 41 fumes 41 COPD 41 ozone 41 cigarette butts 41 asthma 41 pesticides 40 smog 40 bed bugs 40 American Cancer Society 40 heart disease 40 greenhouse gases 40 trans fat 40 BPA 40 germs 40 contaminants 40 Surgeon General 40 soot 40 HPV 39 respiratory illness 39 formaldehyde 39 quit smoking 39 pesticide 39 SIDS 39 cigarette 39 allergens 39 TCE 39 carbon monoxide poisoning 39 cigarettes 39 toxic substances 39 smokes 38 childhood obesity 38 inhaling 38 arsenic 38 obesity 38 ephedra 38 emissions 38 radiation 38 perchlorate 37 carbon dioxide emissions 37 vitamin D 37 odors 37 sulfur dioxide 37 bedbugs 37 dioxin 37 emphysema 37 potentially harmful 37 binge drinking 37 Clean Air 37 benzene 37 smoking cessation 37 workplaces 36 smoked 36 inhale 36 contamination 36 concealed carry 36 carbon dioxide 36 fluoride 36 PCBs 36 radioactivity 36 vapors 36 obese 36 lung function 36 pertussis