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Mayer also showed that heating the sap at 80C (175F) for several hours killed the "infectious substance," but concluded it might be a type of bacterium

The effects of bans are mixed Canadian research showed a fall in smoking rates followed their menthol ban

Behavioral activation, a treatment developed for depression that is focused on increasing participation in enjoyable activities, has shown initial promise in the treatment of substance use disorder (McKay, 2016)

Methods: A comprehensive literature search was conducted in PubMed, Embase, Web of Science, the Cochrane Library, China National Knowledge Infrastructure, and Wanfang Database for studies published up to 12 November 2025