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Abstract：
BACKGROUND: Little is known about the prevalence and predictors of adolescents\' intention to quit or reduce use of e-cigarettes and/or cannabis.
METHODS: Frequencies of intention to change (quit, reduce) e-cigarettes and/or cannabis use were examined among 23,915 surveyed middle and high school students with sole and co-use. Predictors of intention to change were identified via LASSO/multilevel logistic regression.
RESULTS: Among those with sole e-cigarette use (n = 543), 40.9 % intended to quit and 24.1 % intended to reduce; non-daily e-cigarette use predicted intention to quit and reduce e-cigarettes (p\'s < 0.03). Among those with sole cannabis use (n = 546), 10.6 % intended to quit and 25.1 % intended to reduce; absence of cannabis cravings predicted intention to reduce cannabis use (p < 0.01). Among those with co-use (n = 816), 26.2 % intended to either quit or reduce (quit/reduce) both substances, 27.5 % intended to quit/reduce e-cigarettes only, and 6.9 % intended to quit/reduce cannabis only. No predictors emerged for intention to change e-cigarette use among those with co-use (p\'s > 0.09), but younger age, lack of poly-tobacco use, and lack of cannabis craving predicted intention to quit/reduce cannabis use (p\'s < 0.04).
CONCLUSIONS: More than half of adolescents with past-month e-cigarette use, regardless of concurrent cannabis use, expressed interest in changing their use. However, only heaviness of e-cigarette use emerged as a predictor of intention to change suggesting. While fewer students expressed interest in changing their cannabis use, cannabis cravings and poly-tobacco use predicted intent to change. Overall, findings emphasize the need to tailor interventions towards adolescents engaging in more problematic substance use patterns.
METHODS: Frequencies of intention to change (quit, reduce) e-cigarettes and/or cannabis use were examined among 23,915 surveyed middle and high school students with sole and co-use. Predictors of intention to change were identified via LASSO/multilevel logistic regression.
RESULTS: Among those with sole e-cigarette use (n = 543), 40.9 % intended to quit and 24.1 % intended to reduce; non-daily e-cigarette use predicted intention to quit and reduce e-cigarettes (p\'s < 0.03). Among those with sole cannabis use (n = 546), 10.6 % intended to quit and 25.1 % intended to reduce; absence of cannabis cravings predicted intention to reduce cannabis use (p < 0.01). Among those with co-use (n = 816), 26.2 % intended to either quit or reduce (quit/reduce) both substances, 27.5 % intended to quit/reduce e-cigarettes only, and 6.9 % intended to quit/reduce cannabis only. No predictors emerged for intention to change e-cigarette use among those with co-use (p\'s > 0.09), but younger age, lack of poly-tobacco use, and lack of cannabis craving predicted intention to quit/reduce cannabis use (p\'s < 0.04).
CONCLUSIONS: More than half of adolescents with past-month e-cigarette use, regardless of concurrent cannabis use, expressed interest in changing their use. However, only heaviness of e-cigarette use emerged as a predictor of intention to change suggesting. While fewer students expressed interest in changing their cannabis use, cannabis cravings and poly-tobacco use predicted intent to change. Overall, findings emphasize the need to tailor interventions towards adolescents engaging in more problematic substance use patterns.
摘要：
背景：关于青少年打算戒烟或减少使用电子烟和/或大麻的患病率和预测因素知之甚少。
方法：意图改变的频率(退出，reduce)在23,915名接受调查的初中和高中学生中检查了电子烟和/或大麻的使用情况。通过LASSO/多水平逻辑回归确定改变意图的预测因子。
结果：在仅使用电子烟的人中（n=543），40.9%的人打算戒烟，24.1%的人打算减少；非日常电子烟使用预测戒烟和减少电子烟的意图（p<0.03）。在那些单独使用大麻的人中（n=546），10.6％的人打算戒烟，25.1％的人打算减少；没有大麻渴望预测减少大麻使用的意图（p<0.01）。在有共同使用的人中(n=816)，26.2％打算戒烟或减少（戒烟/减少）这两种物质，27.5%的人打算戒烟/减少电子烟，6.9%的人只打算戒烟/减少大麻。在共同使用的人群中，没有出现改变电子烟使用意图的预测因素(p>0.09)，但是年龄更小,缺乏多烟草的使用，和缺乏大麻渴望预测戒烟/减少大麻使用的意图(p<0.04)。
结论：超过一半的青少年过去一个月使用电子烟，不管同时使用大麻，表示有兴趣改变其用途。然而,只有大量的电子烟的使用出现了一个预测的意图改变的建议。虽然较少的学生表示有兴趣改变他们的大麻使用，对大麻的渴望和聚烟草的使用预测了改变的意图。总的来说,研究结果强调,有必要针对青少年使用更有问题的药物模式调整干预措施.
方法：意图改变的频率(退出，reduce)在23,915名接受调查的初中和高中学生中检查了电子烟和/或大麻的使用情况。通过LASSO/多水平逻辑回归确定改变意图的预测因子。
结果：在仅使用电子烟的人中（n=543），40.9%的人打算戒烟，24.1%的人打算减少；非日常电子烟使用预测戒烟和减少电子烟的意图（p<0.03）。在那些单独使用大麻的人中（n=546），10.6％的人打算戒烟，25.1％的人打算减少；没有大麻渴望预测减少大麻使用的意图（p<0.01）。在有共同使用的人中(n=816)，26.2％打算戒烟或减少（戒烟/减少）这两种物质，27.5%的人打算戒烟/减少电子烟，6.9%的人只打算戒烟/减少大麻。在共同使用的人群中，没有出现改变电子烟使用意图的预测因素(p>0.09)，但是年龄更小,缺乏多烟草的使用，和缺乏大麻渴望预测戒烟/减少大麻使用的意图(p<0.04)。
结论：超过一半的青少年过去一个月使用电子烟，不管同时使用大麻，表示有兴趣改变其用途。然而,只有大量的电子烟的使用出现了一个预测的意图改变的建议。虽然较少的学生表示有兴趣改变他们的大麻使用，对大麻的渴望和聚烟草的使用预测了改变的意图。总的来说,研究结果强调,有必要针对青少年使用更有问题的药物模式调整干预措施.
