Smoking 19 Smoke 14 Air 9 Pollution 9 Tobacco 7 Physiological effect 6 Smoke prevention 6 Tobacco use 6 Air quality management 4 Combustion gases 4 Smoke plumes 4 Toxicology 4 Analysis 3 Congresses 3 Mathematical models 3 Research 3 Tobacco habit 3 Aerosols 2 Cigarette smoke 2 Drug abuse 2 Dust 2 Environmental aspects 2 Fire prevention 2 Fire testing 2 Juvenile literature 2 Nicotine 2 Optical properties 2 Prevention 2 Social aspects 2 Tobacco use disorder 2