techincally its a no no, but i havent gotten blown up yet so...im not too worried...i like to watch the hardcore rednecks who not only leave their engines on, but are also smoking a cigarette...
theoretically, the only way you could ignite gas with a cigarette is if you put the cherry end in the gas and take a drag...its not hot enough to ignite it just being lit...
just like a couple i used to know what never used birth control...just pulled out....hadn't gotten pregnant yet, so they werent worried. then the girl got pregnant, left the guy and moved across the country. he's only seen his kid once or twice so be careful! just because you haven't blown up yet doesnt mean you wont get your car pregnant and then it will run away and you cant see your carbaby