It doesn't seem to affect me, I need the same amount of insulin on days when I smoke a lot as on days I smoke little. (not the same amount of insulin every day but the amount doesn't seem to be affected by smoking)
On the other hand, I can't compare with non smoking days, as they don't exist, so I can't be sure.
I think if there would be an effect it would be directly after smoking, like with food, so I would expect that to be visible on the graph from my Freestyle Libre. It isn't.