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rather, it generally examines its impact on a set of proxies or determinants (i.e., secondary outcomes) that are known to contribute to reducing smoking prevalence within a comprehensive tobacco control strategy

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A properly licensed machine in the right location is much easier to scale than one placed quickly without approval.

Fun fact : Inflight smoking was once permitted before some tragic accidents

Another limitation of the study is that the participants were mostly white and in their 60s and 70s, so the smoking patterns collected in the study reflect only a particular set of age groups in the United States