The answer, sadly, is D - ban vape shops which sell cigarettes to zero youth in Daly City. Moreover, youths are not even allowed in these vape shops and it would be quite easy to adopt rules to ensure that youths do not have access to these stores.

Readers should be cautioned that this study should not be used to conclude that e-cigarettes are twice as effective as NRT for smoking cessation generally, for reasons explained articulately by Carl Phillips in his on this study.

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