Physiological effect Toxicology 90 Health aspects 83 Alcohol 71 Radiation 63 Drugs 58 Tobacco 57 Gehiago ... Therapeutic use 55 Environmental aspects 53 Psychological aspects 48 Pollution 46 Chemicals 34 Research 33 Metabolism 32 Smoking 32 Alcoholism 31 Music 30 History 29 Diseases 28 Space flight 27 Heat 24 Air 22 Cancer 21 Electromagnetism 21 Safety measures 21 Social aspects 21 Drug abuse 19 Marijuana 19 Water 19 Light 18 gutxiago ...