I don't know too many owners who would want to stake their broadcast licenses on that.
It’s probably a good thing I don’t own a television station then.
Historical context is key. The shows in question aired
decades ago. Their associated advertisements are deals that were made
decades ago and are completely and totally null and void today — no new deals are being struck with the cigarette corporations, certainly. The entire broadcast(s), minus present day ad inserts, are of a noticeably different era in history and would, presumably, be viewed as such to virtually all viewers, ads and all.
It would help if there was a precedent set as for whether or not such ads have been allowed to be shown alongside the shows they accompanied via direct sponsorship. A couple of quick Google searches reveals very little, and it’s quite possible no network has ever even tried, especially given how low of demand exists for such dated programs to be rebroadcast. In such a case, it might just be easier to not air such shows at all than to go through the hassle of getting permission from the FCC.