Related by context. Frequent words. (Click for all words.) 73 smokers 67 secondhand smoke 63 nonsmoker 60 nonsmoking 57 secondhand smoke exposure 57 smoker 54 cigarette smokers 53 passive smoking 53 Smokers 51 smoking 50 cigarette smoking 49 cigarette smoke 49 Secondhand smoke 48 smoking bans 47 smoke 46 nonusers 46 tea drinkers 44 abstainers 44 smoking ban 44 banning smoking 43 COPD 43 heterosexuals 43 Cigarette smoking 43 smokefree 43 cotinine 42 lung function 42 colorectal cancers 42 quit smoking 42 HPV infection 42 lung cancer 42 nicotine 42 Clean Indoor 42 breast cancers 42 lung cancers 41 drinkers 41 Smoking 41 colon cancers 41 binge drink 41 Lung cancer 41 obese 41 pre menopausal 41 Caucasians 41 post menopausal 41 postmenopausal women 41 respiratory symptoms 41 carcinogens 41 nicotine dependence 41 Hispanic whites 41 exercisers 41 ischemic stroke 41 NAFLD 40 PM#.# 40 endometrial cancer 40 preterm births 40 binge drinkers 40 invasive breast cancer 40 chronic cough 40 asthmatics 40 cardiovascular mortality 40 smoking cessation 40 smoked 40 quitting smoking 39 cigar bars 39 caffeine intake 39 die prematurely 39 cohabiting couples 39 postmenopausal 39 coronary heart 39 preterm delivery 39 rectal cancer 39 modifiable risk 39 patients 39 nanograms per 39 oral contraceptives 38 adenocarcinoma 38 particulate pollution 38 smoked cigarettes 38 prostate cancers 38 chronic bronchitis 38 cardiovascular disease 38 lung tumors 38 precancerous lesions 38 diesel exhaust 38 colorectal cancer 38 mSv 38 statin 38 adolescents 38 migraine sufferers 38 premenopausal women 38 gum disease 37 troponin 37 coffee drinkers 37 gestational diabetes 37 adults 37 abdominal obesity 37 childbearing age 37 workplaces 37 smokes 37 sexually active 37 quitters 37 decaffeinated coffee