| http://www.w3.org/ns/prov#value | - Indirect evidence, based on comparative prevalence trend data for cigarette smoking and ST use among adolescents and adults in Sweden over the past 20 years, are cited to support this position: if ST is a gateway to cigarette smoking, then smoking prevalence would not decrease at the same time ST use increased [4].Comparative population-based prevalence trend data for ST use and cigarette smoking
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