Introduction:
The purpose of this pilot study was to investigate smoking behaviors and subjective and physiological effects of nicotine on young adult occasional waterpipe smokers.
Methods:
This study utilized a repeated-measures design that included one repeated factor for condition (nicotine and non-nicotine). For each participant, the sequencing of the repeated factor was assigned using random allocation. The two nicotine conditions were nicotine (0.75 g) and non-nicotine (0 g placebo) tobacco. Over the course of two weeks, twenty-two participants completed subjective (Acute Subjective Effects of Nicotine) and physiological (blood pressure, heart rate, and CO level) measures. Additional measures (QSU and MNWS-R) were used to assess for withdrawal symptoms.
Sample:
The participants (n = 22) were young adults (23 ± 3.1 years); 71% smoked waterpipe once a month in the past year and 29% smoked waterpipe 1–2 times per week. In addition, 60% reported sharing their waterpipe with friends while smoking. None of the participants reported using any other forms of tobacco products.
Results:
Under the nicotine condition, participants tended to smoke longer (i.e. smoking duration, p = 0.004), take more puffs (p = 0.03), take shorter puffs (p = 0.03), and inhale less volume with each puff (p = 0.02). The repeated measures analysis of the factor headrush revealed an effect of the nicotine condition (F = 9.69, p = 0.001, partial η2 = 0.31) and time (F = 8.17, p = 0.02, partial η2 = 0.30). Heart rate increased significantly across the nicotine condition (F = 7.92, p = 0.01, partial η2 = 0.31) and over time (F = 12.64, p = 0.01, partial η2 = 0.41).
Conclusions:
This study demonstrates how differences between nicotine and non-nicotine waterpipe smoking are associated with changes in smoking behaviors, experiencing a headrush and an increase in heart rate.