[Health Effects Accompanying the Transition from Cigarettes to Heat-not-burn Tobacco: Nicotine Dependence, Nicotine Withdrawal Symptoms, and Changes in Smoking Behaviors].

OBJECTIVES

The purposes of this research were to investigate the hazardous effects of heat-not-burn tobacco and to clarify the health effects accompanying the transition from cigarettes to heat-not-burn tobacco.

METHODS

The concentrations of carbon monoxide, ammonia, formaldehyde, acetaldehyde, and dust (hazardous substances) were measured in the smoke of heat-not-burn tobacco. Twenty-nine smokers were used as the subjects. The concentrations of hazardous substances were measured in exhalation of heat-not-burn tobacco. The concentration of cotinine in saliva was also measured after the transition. A questionnaire survey was performed before and after the transition to evaluate nicotine dependence, nicotine withdrawal symptoms, and smoking behaviors.

RESULTS

In the mainstream smoke, all hazardous substances investigated were detected. Carbon monoxide and dust were detected in the exhalation of heat-not-burn tobacco. The concentration of cotinine in the saliva of heat-not-burn tobacco users corresponded to that of cigarette smokers. Cigarette smoking was significantly positively related to the score of Fagerström Test for Nicotine Dependence (FTND). Heat-not-burn tobacco was significantly positively related to FTND and Minnesota Nicotine Withdrawal Scale (MNWS) scores. The group in which the number of heat-not-burn tobacco sticks consumed increased after transition showed a smaller number of cigarettes consumed and a higher MNWS score before transition than the group in which it decreased after transition. These two factors were significantly related to the difference between the numbers of cigarettes and heat-not-burn tobacco sticks in multiple linear regression analysis.

CONCLUSIONS

The mainstream smoke of heat-not-burn tobacco contains harmful substances. There were the possibilities that nicotine dependence and nicotine withdrawal symptoms appear after transition and that the number of heat-not-burn tobacco sticks consumed increases.