Fact
Urea was found in cigarettes. Urea is also found in Pee.
Source 1:
Covington & Burling. "Summary of Data on Urea." Truth Tobacco Industry Documents. 05 Feb. 1993. Report.
https://industrydocuments.library.ucsf.edu/tobacco/docs/#id=ptwy0082
Source 2:
"Cigarette Ingredients. R.J. Reynolds List of Ingredients." R.J. Reynolds. 2013. Web.