Yes, I would still flower/harvest a hermie...but I would more than likely put it and its clones outside to finish so it wont pollenate my true fems inside.
As far as the seeds, depends on the smoke..if the smoke is trash - i'd trash the seeds, if it was pretty decent I'd take my chances and grow them. It wouldnt make sense to throw out perfectly good seeds bcuz of something I couldnt control.
I think every plant has the hermie gene in them, even ones from the seedbanks, but they have a lower chance of going hermie bcuz of the way they were bred. Unless someone actually took the time and isolated the hermie gene in a seed and destroyed it completely, I believe it is still present in each seed but things like stress, training, and age of the plant could cause it to reveal its true sex.