Fact
Hydrazine is found in cigarettes. Hydrazine is also found in rocket fuel.
Source 1:
"Smoking and Tobacco Control." U.S. Department of Health and Human Services, Public Health Service, National Institutes of Health, National Cancer Institute. Risks Associated with Smoking Cigarettes with Low Machine-Measured Yields of Tar and Nicotine, Oct. 2001: 180.
http://cancercontrol.cancer.gov/tcrb/monographs/13/m13_complete.pdf
Source 2:
"HYDRAZINE, 1,1-DIMETHYLHYDRAZINE AND 1, 2-DIMETHYLHYDRAZINE." Agency for Toxic Substances and Disease Registry, June 2013.