At one stage, Cyrus starts a massive fire by throwing a cigarette. In reality, you can't ignite gasoline with a cigarette ash, there isn't enough power. The reason you can't smoke at gas stations is because of the danger of naked flames caused by matches or cigarette lighters.
Actually, if I remember my training correctly, a cigarette can ignite that gas. Gas fumes have a low flash point. I believe it's something like 120, and there's a high concentration along the ground. Also, as FYI, it is the fumes that catch fire, not the liquid itself.
A single cigarette has the power to burn down a whole house. All it needs is something to ignite it... even a simple piece of note book paper. Also, when you strike a match you smell a burning smell and fumes. When you ignite a lighter, you smells fumes sometimes as well. And when you first light a cigarette, is smells more like burning paper that a cigarette and nicotine. Fires can very easily be caused by fumes. 99.9% of the time, that is in fact how they are started. I wouldn't recommend trying to support your statement, unless you would like to really see an explosion that big!