Lol this topic reminded me of travelling to Ardlethan with my uncle as a kid. He was a fuel truckie for Shell for decades and had retired by this point, but used to scare the bejesus out of me every time we stopped at a servo. Being a chain smoker he always had a smoke hanging out the corner of his mouth as he filled the car. I was often thinking "This is my last day on this planet" and many times I'd see a panicked servo attendant flying out of his warm premises, skin deathly pale as he yelled at my uncle. My uncle used to just laugh at them, tell them how many years he'd carted fuel around the country, finish filling up then go in and pay. I eventually got brave enough to ask him to stop and he told me there was never any danger anyway, as the ignition point is too high for a cigarette to ignite it.
I did find out years later of course that he was right up to a point - a lit cigarette will not in normal circumstances ignite petrol, however a cigarette that is actively being smoked has a chance to ignite petrol fumes.