加拿大、英国和美国青少年中吸电子烟和普通烟的流行情况（JCO,IF：28）
Prevalence of vaping and smoking among adolescents in Canada, England, and the United States: repeat national cross sectional surveys
Hammond D, Reid JL, Rynard VL, et al. Prevalence of vaping and smoking among adolescents in Canada, England, and the United States: repeat national cross sectional surveys. BMJ 2019;365:l2219.
Correspondence to:D Hammond dhammond@uwaterloo.ca(or @davidhammondphd on Twitter;
OBJECTIVE 目标
To examine differences in vaping and smoking prevalence among adolescents in Canada, England, and the United States.
研究加拿大、英国和美国青少年吸电子烟和吸烟流行程度的差异。
DESIGN 设计
Repeat cross sectional surveys.
重复性横断面调查。
SETTING 设置
Online surveys in Canada, England, and the US.
加拿大、英国和美国的线上调查。
PARTICIPANTS 参与者
National samples of 16 to 19 year olds in 2017 and 2018, recruited from commercial panels in Canada (n=7891), England (n=7897), and the US (n=8140).
2017年和2018年，从加拿大(n=7891)、英国(n=7897)和美国(n=8140)的商业委员会收集了16至19岁的全国样本。
MAIN OUTCOME MEASURES 主要结果及措施
Prevalence of vaping and smoking was assessed for use ever, in the past 30 days, in the past week, and on 15 days or more in the past month. Use of Juul (a nicotine salt based electronic cigarette with high nicotine concentration) and usual vaping brands were also assessed. Logistic regression models examined differences in vaping and smoking between countries and over time.
评估曾在过去30天、过去一周和过去一个月中有不少于15天使用电子烟和吸烟的情况。研究人员还评估了JUUL(一种高尼古丁盐含量的电子烟)和常用电子烟品牌的使用情况。使用逻辑回归模型评估了吸电子烟和普通烟在几个国家之间的差异。
RESULTS 结果
The prevalence of vaping in the past 30 days, in the past week, and on 15 days or more in the past month increased in Canada and the US between 2017 and 2018 (P<0.001 for all), including among non-smokers and experimental smokers, with no changes in England. Smoking prevalence increased in Canada (P<0.001 for all measures), with modest increases in England, and no changes in the US.
2017年至2018年期间，加拿大和美国在过去30天、过去一周以及过去一个月中超过15天使用电子烟的情况有所增加(包括非吸烟者和实验吸烟者)，英国的情况没有变化。加拿大的吸烟率有所上升(所有指标P<0.001)，英国略有上升，美国则没有变化。
The percentage of ever vapers who reported more frequent vaping increased in Canada and the US (P<0.01 for all), but not in England. The use of JUUL increased in all countries, particularly the US and Canada—for example, the proportion of current vapers in the US citing JUUL as their usual brand increased threefold between 2017 and 2018.
在加拿大和美国，经常吸电子烟的人所占的比例有所增加(P<0.01)，但在英国没有增加。JUUL在所有国家的使用都有所增加，尤其是美国和加拿大。例如，2017年至2018年间，将JUUL作为其常用品牌的美国消费者比例增加了两倍。
CONCLUSIONS 结论
Between 2017 and 2018, among 16 to 19 year olds the prevalence of vaping increased in Canada and the US, as did smoking in Canada, with little change in England. The rapidly evolving vaping market and emergence of nicotine salt based products warrant close monitoring.
2017年至2018年间，加拿大和美国16岁至19岁人群中吸电子烟的比例有所上升，加拿大也是如此，而英国的这一比例几乎没有变化。快速发展的电子烟市场和尼古丁盐高含量产品的出现需引起关注。
