The purpose of this study is to investigate the effect of the level of realism of the game character provided in the smoking simulation game on user experience, such as psychological stress, psychological resistance, immersion, and awakening of the smoking behavior. The results showed that psychological stress, psychological resistance, arousal/awakening, and immersion were higher with higher levels of self-existence, and that psychological effects were associated with the levels of self-existence. It is expected that it will change the perception of smoking.