I'll chime in because I've been using cannabis for over 50 years. First off, I've never suffered with anxiety. if anything, THC has been a great help in relieving that for me.
I also say that over those years there have been long spells of time when I couldn't get any weed, and again, never had issues with that either. No "withdrawal" issues or anxiety issues at all.
The only weed induced anxiety I've ever experienced was caused by knowing I could get arrested for possession, but that's never happened, and where I live now it's legal, so I don't have to worry about that anymore.
Personally, I think that the social stigma associated with "refer madness" may be related to weed induce anxiety.
But there are studies that indicate THC does affect people differently and that genetics may have something to do with that. For example, those who suffer with psychoses may have issues with weed triggering psychotic episodes, but I recently read that CBD may reduce those events.
I think it would be interesting to hear from those dealing with anxiety if CBD relieves that.