1. The hydrocarbons -- 2. Alcohols and phytosterols -- 3. Aldehydes and ketones -- 4. Carboxylic acids -- 5. The esters -- 6. The lactones -- 7. Anhydrides -- 8. Carbohydrates and their derivatives -- 9. Phenols and quinones -- 10. The ethers -- 11. Nitriles -- 12. Acyclic amines -- 13. Amides -- 14. Imides -- 15. N-nitrosamines -- 16. Nitroalkanes, nitroarenes, and nitrophenols -- 17. Nitrogen heterocyclic components -- 18. Miscellaneous components -- 19. Fixed and variable gases -- 20. Metallic and nonmetallic elements, isotopes, ions, and salts -- 21. Pesticides and growth regulators -- 22. Genes, nucleotides, and enzymes -- 23. "Hoffmann analytes" -- 24. Tobacco and/or tobacco smoke components used as tobacco ingredients -- 25. Pyrolysis -- 26. Carcinogens, tumorigens, and mutagens vs. anticarcinogens, inhibitors, and antimutagens -- 27. Free radicals -- 28. Summary.