Gasoline ignites at 500-540 degrees and a cigarette burns at 450 degrees, so it is unlikely it will light the gasoline. A lot of other things are thought to start fires. A lot of myths are busted.
__________________
Ed & Ruthann / Toby and Tucker
2014 GMC Sierra Crewcab 2500 Duramax
2014 Wildcat 327ck