Nicotine Addiction and Intensity of e-Cigarette Use by Adolescents in the US, 2014 to 2021, in JAMA Pediatrics
key takeaway: "Age at initiation of e-cigarette use decreased and intensity of use and addiction increased between 2014 and 2021. By 2019, more e-cigarette users were using their first tobacco product within 5 minutes of waking than users of cigarettes and all other tobacco products combined."
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