Gasoline has an extremely low flashpoint.
-45 degrees F, to be exact.
That’s minus 45 degrees.
This from the OSHA website:
"Flash point means the minimum temperature at which a liquid gives off vapor within a test vessel in sufficient concentration to form an ignitable mixture with air near the surface of the liquid. The flash point is normally an indication of susceptibility to ignition.
The flash point is determined by heating the liquid in test equipment and measuring the temperature at which a flash will be obtained when a small flame is introduced in the vapor zone above the surface of the liquid. It should be mentioned that flash point was selected as the basis for classification of flammable and combustible liquids because it is directly related to a liquid’s ability to generate vapor, i.e., its volatility.
Since it is the vapor of the liquid, not the liquid itself, that burns, vapor generation becomes the primary factor in determining the fire hazard. The expression “low flash - high hazard” applies. Liquids having flash points below ambient storage temperatures generally display a rapid rate of flame spread over the surface of the liquid, since it is not necessary for the heat of the fire to expend its energy in heating the liquid to generate more vapor."
I’ve seen people successfully plunge a lit cigarette into a container of gasoline without igniting it. The trick, of course, is to be sure there are no vapors hanging around over the top of the liquid, and to get the butt into the liquid as quickly as possible.
Chances are the bad guy in the puddle will be swooning from the fumes and offering him one last cigarette might not be the humane thing to do.