I don't think, generally people smoke at gas stations, as they're often admonished by staff, from what I've seen, especially around gas tanks as it is a real danger, what with guys in striped shirts all over the place getting their diesel. I respectfully don't believe she's smoking or putting out a cigarette. It looks like she's picking something she notices up, like a coin or something. Her distraction looking down and picking whatever up coincides with the big guy in the striped shirt and smaller container shuffling off, away from the pump by her car, into the unseen part of the station parking lot.