It feels good to see the pieces lining up before they all fall into place when reading Jojo. As cigarettes have only generally been used before due to plot relevance and in Jotaro’s case, finding a stand user, I'd say this is definitely a callback to that. Thinking Iggy was onto their enemy and saved them from poison intentionally now feels even stronger because he carried the bomb back. Both of those and a fake Jotaro which would blow up instead of the real absolutely came together, all three of these colliding. Admittedly, I don’t think this is hard to do, Oingo even stated even an idiot would know that he’d explode if he entered the car, but it's fun regardless. A feeling of satisfaction that has been recurrent in Jojo with how it foreshadows its arcs.
Overall this was just hysterical. Seeing Oingo play the part of Jotaro horribly and get absolutely bullied by his peers was too much fun. “Y-y-yare yare daze”, while shaking violently. I was assuming that Joseph knew, and Iggy knew as it has great senses, whereas only Polnareff was left in the dark. But then after he started to taunt Oingo and make him suffer with the five cigarettes trick, presumably only exposing him further, I started to think everyone was in on it. I wouldn’t even question this if not for a fellow poster suggesting this was more akin to Kakyoin’s cherry habit, a weird trick that Jotaro does in his down time when messing around. And if I do want to go with their reading then there is a strong basis for it. Polnareff is an idiot, Oingo can change even his scent to match Jotaro’s so arguably Iggy shouldn't catch on, and Joseph has always shown some stupidity at times and the story is very purposefully contrived at times as well.
It’s odd I’m referencing Fukumoto’s Strongest Man Kurosawa twice in these Jojo posts, but seeing fake Jotaro thinking he was about to die in the car ride gave me vivid flashbacks to an early chapter of Kurosawa.