how much has tobacco use decreased 20-Year Trends in Sales and Self-Reported Tobacco in the United States, 2000–2020 Smoking: an avoidable health disaster

Although schools were purposively stratified by gender composition to maximise diversity, selection relied on local gatekeepers, which may have introduced recruitment bias despite efforts to include staff and pupils of different ages, backgrounds, and smoking exposures

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Similar content being viewed by others Background Approximately 2 billion people worldwide use tobacco products, mostly in the form of cigarettes, with tobacco smoking-related diseases resulting in at least 4 million global deaths per year [1]