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Does smoking change a person's character?

More and more people realize that although our personality characteristics are stable enough to deeply shape our life, they are also plastic to a certain extent. The harmful effects of smoking can lead to personality changes and even affect people's future personality development. The results show that over time, smoking may also change people's unique thinking, emotion and behavior patterns, which will further deepen people's understanding of the impact of smoking. Now there is evidence that smokers are more unstable and less conscientious than non-smokers. Yannick Stephan, who led the study, said some bad habits can feed back and shape smokers' personality traits. After years of testing people's personality traits over and over again, researchers report that smokers' personality changes are different from those of non-smokers, especially in terms of emotional stability and decreased extroversion. The data came from five large-scale surveys of middle-aged and elderly volunteers, four in the United States and one in Japan. The number of respondents ranged from 600 to 6000, including whether the respondents smoked or not, and their personality traits in 4-20 years. In general, the results of this study show that compared with non-smokers, smokers have decreased emotional stability, extroversion, openness, affinity and consciousness. However, the precise pattern of change was different among different subjects. The most consistent pattern was the relative decline of emotional stability and extroversion of smokers. The team also looked at whether quitting smoking had a positive impact on people's personality. In fact, there is little evidence to support this. If so, cessation of smoking is closely associated with decreased affinity. The researchers speculate that this may be due to a decrease in "social interaction related to smoking", with some of the adverse effects of smoking remaining, and also due to the increased risk of health side effects associated with smoking cessation, such as obesity and type 2 diabetes, both of which have a detrimental effect on personality traits. This study is very useful for the range of respondents and the longitudinal method used to track and analyze the same population over a long period of time. However, the study was limited by the participants' self-report on their own characteristics and lacked information on smoking intensity. For the older respondents, it was also unable to explain why smoking led to poor personality characteristics of most people. The researchers speculate that the health hazards of smoking may only be the apparent effects on personality. Smoking can have many health effects, such as insomnia, depression, cardiovascular health decline, and have a negative impact on personality. In addition, smoking may change the energy needed to maintain emotional stability, and change the tendency of exploration, cooperation, altruism, self-discipline, naughtiness, enthusiasm and activity.