Smoking is a disservice to not only for smokers who smoke, but also for nonsmokers due to smoke or smell. In particular, smoking harms health by increasing the discomfort associated with the smell generated by burning the cigarette, and giving rise to lung injury or cancer caused by smoke inhalation. The purpose of this study was to investigate the characteristics of various concentrations of nicotine, PM2.5, and heavy metals (As, Cr, Cd, Pb) generated by smoking according to the smoking intensity. When smokers smoked continuously, the amount of nicotine, PM2.5, Cr, and Cd produced by smoking increased proportionally and became statistically significant. However, As and Pb showed a different pattern from other materials, and the concentration increased by 2~3 times when 10 cigarettes were smoked. As for the change in PM2.5 for 12 hours immediately after smoking, about 70% of the particles were deposited on the floor or wall even in a sealed room where no ventilation was available, and the concentration naturally decreased. However, the remaining particles were found to remain in the air even though the time passed exceeded 12 hours.

Abstract
1. 서 론
2. 연구방법
3. 결 과
4. 고 찰
5. 결 론
References

• 원수란(국립환경과학원 생활환경연구과) | Soo Ran Won (Indoor Environment & Noise Research Division, National Institute of Environmental Research (NIER))
• 지현아(국립환경과학원 생활환경연구과) | Hyun Ah Ji (Indoor Environment & Noise Research Division, National Institute of Environmental Research (NIER))
• 권명희(국립환경과학원 화학물질연구과) | Myunghee Kwon (Chemicals Research Division, National Institute of Environmental Research (NIER))
• 심인근(국립환경과학원 생활환경연구과) | In-Keun Shim (Indoor Environment & Noise Research Division, National Institute of Environmental Research (NIER)) Corresponding author