Supplementary evidence came from trade associations such as the US Tobacco Merchants Association, Eurostat retail scanner panels, and health ministry prevalence surveys
Sleep disturbances and fatigue further increase sensitivity and make recovery more difficult
Carbon monoxide (CO) has various industrial and medical applications, despite its toxicity
Stubbing out cigarette use Coronary heart disease and stroke are common disorders and causes of death, with 370,000 and 140,000 deaths from heart disease and stroke, respectively each year in the US alone (compared with 155,000 for lung cancer)
Stratified analyses by sex, age group, and education level Subgroup analyses by sex, age group, and education level largely mirrored the overall findings