Intermittent, dual use of cigarettes and e‐cigarettes is a common pattern among youth and young adults. However, little is known about the validity of self‐report measures of nicotine consumption in these populations. The goal of the present study was to examine associations between self‐reported frequency of cigarette and e‐cigarette use and nicotine levels in hair samples at two assessments 1 year apart.

中文翻译：

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年轻人非日常吸烟者自我报告和尼古丁消费的生物学测量之间的关联。

年轻人和年轻人普遍断断续续地使用香烟和电子烟。但是，对于这些人群中尼古丁消耗量自我报告测量方法的有效性知之甚少。本研究的目的是在间隔1年的两次评估中，检查自我报告的卷烟和电子烟使用频率与头发样本中尼古丁水平之间的关联。