Department of Psychology, University of Canterbury, Christchurch, New Zealand;
School of Biological Sciences, Victoria University of Wellington, Wellington, New Zealand;
Nicotine Tob Res. 2015 Nov;17(11):1393-6. doi: 10.1093/ntr/ntv025. Epub 2015 Mar 5.
Cigarette purchase tasks (CPTs) are used increasingly to measure simulated demand curves for tobacco. However, there is currently limited information about the temporal stability of demand curves obtained from these tasks.
We interviewed a sample (N = 210) of smokers in New Zealand both before and after a 10% increase in the tobacco excise tax that took effect on January 1, 2013. Participants were interviewed in November-December 2012 (wave 1) and February-March 2013 (wave 2). At each interview, participants completed a high-resolution CPT with 64 prices ranging from NZ $0.00 to NZ $5.00/cigarette, and questionnaires regarding their smoking habit.
Roll-your-own smokers had higher levels of nicotine dependence and tobacco demand based on CPT responses than factory-made smokers. Although demand curves for waves 1 and 2 were similar, intentions to purchase cigarettes were significantly less at wave 2 for three prices (NZ $0.85, NZ $0.90, and NZ $0.95) that were just higher than the actual price after the tax increase, for both roll-your-own and factory-made smokers. Measures of elasticity (α) derived from Hursh and Silberberg's model were significantly greater at wave 2 than wave 1, and there was a significant reduction in smoking habit as measured by cigarettes/day and the Fagerström Test for Nicotine Dependence at wave 2.
Purchase tasks can discriminate between smokers based on their tobacco preference, and although results are relatively stable over time, they depend on contextual factors such as the current real price for tobacco.
香烟购买任务（CPT）越来越多地用于测量烟草的模拟需求曲线。然而，目前关于从这些任务中获得的需求曲线的时间稳定性的信息有限。
我们在新西兰对吸烟者进行了一项调查（N=210），调查时间在 2013 年 1 月 1 日生效的烟草消费税增加 10%前后。参与者在 2012 年 11 月至 12 月（第 1 波）和 2013 年 2 月至 3 月（第 2 波）接受采访。在每次采访中，参与者都完成了一个高分辨率的 CPT，价格范围从新西兰元 0.00 到 5.00 纽币/支，以及关于他们吸烟习惯的问卷。
卷制烟民的尼古丁依赖和基于 CPT 反应的烟草需求水平高于机制烟民。尽管第 1 波和第 2 波的需求曲线相似，但在第 2 波，对于刚刚高于消费税增加后的实际价格的三个价格（新西兰元 0.85、0.90 和 0.95），购买香烟的意愿明显降低，无论是卷制烟民还是机制烟民。Hursh 和 Silberberg 模型得出的弹性（α）衡量标准在第 2 波明显高于第 1 波，并且第 2 波的吸烟习惯（以每天吸烟量和尼古丁依赖 Fagerström 测试衡量）显著降低。
购买任务可以根据吸烟者的烟草偏好进行区分，尽管结果相对稳定，但它们取决于当前烟草实际价格等环境因素。
