Until now, however, it was not clear how
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The authors explain, If a student is caught using a product marketed as tobacco-free, school administrators or parents may not realize local/state or school policies prohibit its use on school grounds. All products containing nicotine should be considered tobacco products and treated as such in schools and workplaces
Both studies also relied on self-reported smoking behaviour without biochemical verification, which could introduce bias, and only studied male participants, which limit the generalisability of the results