Related by context. Frequent words. (Click for all words.) 52 cotinine levels 52 epidemiologic studies 52 hookah smoking 49 chronic rhinosinusitis 48 CMV infection 48 vitamin D insufficiency 48 cigarette smoking 48 fasting glucose levels 48 NAFLD 48 prevalence 48 neuropsychiatric symptoms 48 vitamin D deficiency 48 Epidemiological studies 48 postmenopausal breast cancer 48 folate intake 48 nondrinkers 48 abdominal obesity 48 postoperative complications 47 waterpipe 47 Passive smoking 47 Vitamin D deficiency 47 Health HSPH 47 organophosphate pesticides 47 obese adolescents 47 migraineurs 47 menarche 47 sheesha 47 prenatal exposure 46 premenopausal breast cancer 46 gallbladder disease 46 cardio vascular disease 46 nicotine dependence 46 Hospitalizations 46 invasive cervical cancer 46 atopy 46 occupational exposures 46 shisha 46 dietary intakes 46 dental cavities 46 congenital malformations 46 Anxiety disorders 46 Neurology Neurosurgery 46 breastfed babies 46 RLS symptoms 46 uncontrolled asthma 45 cigarette smokers 45 venous thrombosis 45 longitudinal studies 45 studies 45 cigarettes smoked 45 colorectal cancer CRC 45 calcium intake 45 NHANES 45 nondiabetic 45 adolescents 45 secondhand smoke exposure 45 dental fluorosis 45 alcoholic liver 45 depressive symptoms 45 NNK 45 atopic 45 Vitamin D supplements 45 attention-deficit/hyperactivity disorder ADHD 45 VUR 45 rotavirus infection 45 periodontitis 44 gum disease 44 unhealthy diets 44 undernutrition 44 GERD symptoms 44 varicella vaccine 44 BRCA2 mutations 44 caffeine intake 44 inverse association 44 HRQOL 44 hemorrhagic strokes 44 dental caries 44 cardiorespiratory fitness 44 study 44 acamprosate 44 atopic eczema 44 arterial stiffness 44 secondhand tobacco 44 MetS 44 nonadherence 44 dietary patterns 44 esophageal adenocarcinoma 44 parkinsonism 44 Prevalence 44 Alcohol Dependence 44 breast fed 44 fasting insulin 44 asthma exacerbations 43 journal Biological Psychiatry 43 oral contraception 43 serum uric acid 43 inorganic arsenic 43 passive smoking 43 coronary artery calcification 43 epidemiological studies 43 smokers