To the Editor We read with great interest the study by Gomajee and colleagues¹ that shows an apparent association of regular electronic cigarette (EC) use with decreased smoking levels and increased smoking cessation attempts, as well as an increased risk of smoking relapse in the 2-year follow-up of the France general population. In the recent decade, EC use has become popular as a cessation aid among smokers, yet its effectiveness is still subject to ongoing debate.^2,3 The study by Gomajee and colleagues¹ represents a step forward toward a better understanding of long-term smoking trajectories after using ECs. We are, however, concerned about whether there is a dose-dependent association between frequency of EC use and smoking level because this study¹ focused on only daily use of ECs. It is important to provide substantially more robust reporting of these data to better illuminate the effectiveness of EC use.

致编辑我们非常感兴趣地阅读了Gomajee及其同事的研究¹，该研究表明，正常使用电子烟（EC）与吸烟水平降低和戒烟尝试增加以及吸烟复发的风险增加明显相关[2]。法国总人口的三年随访。在最近的十年中，EC的使用已成为吸烟者戒烟的一种辅助手段，但其有效性仍需不断讨论。^{2 ，3}通过Gomajee和同事的研究¹代表使用EC后更好地了解长期吸烟轨迹的进步。但是，我们担心EC使用频率与吸烟水平之间是否存在剂量依赖性关系，因为本研究¹仅关注EC的日常使用。重要的是要提供这些数据的更可靠的报告，以更好地说明EC使用的有效性。