Yeah, as far as I am aware (and as far as my texts suggest) there is no link between longterm cannabis use and paranoia.
That said, like many types of highs, setting and circumstances can ‘guide’ the high towards exaggerated emotions. The paranoia thing probably comes from inexperienced drug users, using drugs while worrying about getting caught. This never happened to me, but it does seem to for others.
So I’m not sure I would rule out weed making someone paranoid in a zombie apocalypse setting. You’re kinda already primed for serious fight/flight anxiety in that situation.