References
- 1. Heck, J., C. Gaworski, N. Rajendran, and R. Morrissey: Toxicological Evaluation of humectants added to cigarette tobacco: 13-week smoke inhalation study of glycerin and propylene glycol in Fischer 344 Rats; Inhal. Toxicol. 14 (2002) 1135–1152.
- 2. Hoffmann, D. and I. Hoffmann: The changing cigarette, 1950–1995; J. Toxicol. Environ. Health 50 (1997) 307–364.
- 3. Browne, C.: The Design of Cigarettes. 3rd ed.; Hoechst Celanese Corp: Charlotte, NC, 1990.
- 4. Rodgman, A.: Some Studies of the Effects of Additives on Cigarette Mainstream Smoke Properties II: Casing Materials and Humectants; Beitr. Tabakforsch. Int. 20 (2002) 279–299.
- 5. Klus, H., G. Scherer, and L. Müller: Influence of Additives on Cigarette Related Health Risks; Beitr. Tabakforsch. Int. 25 (2012) 411–493.
- 6. Friedman, R. and W. Raab: Determination of Tobacco Humectants by Gas Liquid Chromatography; Anal. Chem. 35 (1963) 67–69.
- 7. Giles, J.: Collaborative Study on the Determination of Propylene Glycol, Glycerine, and Triethylene Glycol in Tobacco; J. Ass. Offic. Anal. Chem. 53 (1970) 655–658.
- 8. Williams, J.: Collaborative Study of the Determination of Propylene Glycol, Glycerol, and Triethylene Glycol in Tobacco; J. Ass. Offic. Anal. Chem. 54 (1971) 560–564.
- 9. CORESTA: Routine Analytical Chemistry Sub-Group Technical Report on 2007 Joint Experiment to Update Repeatability and Reproducibility Statistics for: CRM (Determination of 1,2-Propylene Glycol and Glycerol in Tobacco Products by GC); CRM 61 (Deter-mination of 1,2-Propylene Glycol and Glycerol in Tobacco Products by HPLC); Centre for Scientific Research Relative to Tobacco, 2010. 10.CORESTA Recommended Method No. 60: Determination of 1,2-Propylene Glycol and Glycerol in Tobacco and Tobacco Products by Gas Chro-matography; Cooperation Centre for Scientific Research Relative to Tobacco, 2011.
- 11. Health Canada: Determination of Humectants in Whole Tobacco; Health Canada -Official Method T-304, 1999.
- 12. Schubert, J., J. Hahn, G. Dettbarn, A. Seidel, A. Luch, and T. Schulz: Mainstream Smoke of the Waterpipe: Does this Environmental Matrix Reveal as Significant Source of Toxic Compounds?; Toxicol. Lett. 205 (2011) 279–284.
- 13. CORESTA Recommended Method No. 61: Deter-mination of 1,2-Propylene Glycol, Glycerol and Sorbitol in Tobacco and Tobacco Products by High Performance Liquid Chromatography (HPLC); Cooperation Centre for Scientific Research Relative to Tobacco, 2011.