机译:在实施加州烟草21政策之前和之后的年轻成人中的电子卷烟和卷烟购买
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA|Univ Southern Calif Norris Comprehens Canc Ctr Los Angeles CA 90089 USA|Univ Southern Calif Inst Addict Sci Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA|Univ Southern Calif Norris Comprehens Canc Ctr Los Angeles CA 90089 USA|Univ Southern Calif Inst Addict Sci Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA|Univ Southern Calif Norris Comprehens Canc Ctr Los Angeles CA 90089 USA|Univ Southern Calif Inst Addict Sci Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA|Univ Southern Calif Norris Comprehens Canc Ctr Los Angeles CA 90089 USA|Univ Southern Calif Inst Addict Sci Los Angeles CA 90089 USA;
Univ Southern Calif Dept Prevent Med Los Angeles CA 90089 USA|Univ Southern Calif Norris Comprehens Canc Ctr Los Angeles CA 90089 USA|Univ Southern Calif Inst Addict Sci Los Angeles CA 90089 USA;
addiction; electronic nicotine delivery devices; public policy;