Fact
Every day, cows release methane gas into the air. From you know where. But methane is also found somewhere else. Yesiree, in cigarette smoke.
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, 19 Nov. 2001. Report.
http://cancercontrol.cancer.gov/tcrb/monographs/13/m13_complete.pdf
Source 2:
"Methane Background Information, Where Do We Find Methane?" ARM Climate Research Facility. Web.
Source 3:
"Air Emissions." Pennsylvania Department of Environmental Protection. Web.
http://www.dep.state.pa.us/dep/deputate/pollprev/iso14001/bpmanual/CAirAll.htm