Background Since May 2017, standardized packaging has been mandatory in the UK, with packs required to display an ‘information message’ explaining that there are more than 70 carcinogens in tobacco smoke. Methods Three waves of a longitudinal online survey in the UK with smokers pre-standardized packaging (Wave 1: April–May 2016) and followed up post-standardized packaging (Wave 2: September–November 2017, Wave 3: May–July 2019). Of the 6233 smokers at Wave 1, 4293 responded at Wave 2 and 3175 at Wave 3. We explored knowledge of the number of carcinogens in smoke, and whether knowing that smoke contains more than 70 carcinogens mediated change in the belief that the dangers of smoking are exaggerated (risk perception), stubbing out cigarettes, quit intentions and quitting. As the information message is larger on roll-your-own packs than on cigarette packs, as the packs are larger, we also explored whether there was any difference in knowing that smoke contains more than 70 carcinogens between exclusive cigarette smokers and exclusive roll-your-own smokers. Results Knowledge that there are over 70 carcinogens in smoke increased among smokers across waves, with the increase from Waves 1 to 3 greater for exclusive roll-your-own smokers than exclusive cigarette smokers (adjusted odds ratio=1.44; 95% CI 1.03–2.03). Knowledge that there are over 70 carcinogens in smoke mediated higher risk perception but not stubbing cigarettes out, quit intentions or quitting. Conclusions The information message improved knowledge of how many carcinogens are in smoke, particularly among exclusive roll-your-own smokers, and this was linked to higher risk perception.

中文翻译：

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在英国标准化卷烟包装上添加有关烟雾中致癌物质数量信息的影响

背景 自 2017 年 5 月起，英国强制实施标准化包装，要求包装上显示“信息信息”，说明烟草烟雾中含有 70 多种致癌物质。方法 在英国对吸烟者进行三轮纵向在线调查，包括预标准化包装（第一波：2016 年 4 月至 5 月）和标准化后包装后续调查（第二波：2017 年 9 月至 11 月，第三波：2019 年 5 月至 7 月） 。在第 1 波的 6233 名吸烟者中，第 2 波有 4293 名吸烟者做出了回应，第 3 波有 3175 名吸烟者做出了回应。我们探讨了对烟雾中致癌物数量的了解，以及了解烟雾中含有 70 多种致癌物是否会改变人们对吸烟危害的信念。被夸大（风险认知）、掐灭香烟、戒烟意图和戒烟。由于自卷烟包装上的信息信息比卷烟包装上的信息更大，因此我们还探讨了只吸卷烟的人和只吸卷烟的人在了解烟雾中含有 70 多种致癌物质方面是否有任何差异。 -自己的吸烟者。结果 各波吸烟者对烟雾中 70 多种致癌物质的认识有所增加，从第 1 波到第 3 波，专门手卷烟吸烟者的增加幅度大于专门吸烟者（调整后的比值比=1.44；95% CI 1.03-2.03） ）。了解烟雾中含有 70 多种致癌物质会介导更高的风险认知，但不会熄灭香烟、产生戒烟意图或戒烟。结论 该信息提高了人们对烟雾中含有多少致癌物的了解，特别是对于手卷烟吸烟者来说，这与更高的风险认知有关。