| http://www.w3.org/ns/prov#value | - Formal modeling analyses suggest that the reductions in prevalence observed over the last 40 years are due to such policy changes and interventions as tax increases, clean indoor air laws, advertising restrictions, product labeling laws, youth access laws, mass media campaigns, and increased availability of cessation programs 11, 20-29.Policies and Interventions that Could Accelerate Progress duri
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