PURPOSE: This study attempted to grasp the significance of high school boys smoking experiences, and to define its structure, then utilizing the results to create effective nursing intervention in order to protect students from smoking habit. METHOD: This study is based on a phenomenological approach. A group of eight male high school students who had experience in smoking were selected as the subject of this study. Intimate interview with participatory observation were carried out from them and the resulted data were analyzed by Giorgi's method as below. Result: The male high school students' smoking experiences were found to be a direct result from the environments around them and misty curiosity, masculinity, maintenance of close relations with peers, habitualness, stress relief, and concealment from the family. CONCLUSION: The result indicates that the male high school students' smoking, especially in an aspect from its starting point, motivational perspective, attitudes, and recent increasing rate of the juvenile smoking should be recognized as one of the problems that should be resolved. Concurrently, programs for preventing and quitting smoking should be started from the early stage of childhood as possible.