I used to get chronic shit in the beggining when I started smoking weed... lots of skunk, lemon haze, white russian tiger. I would almost never get a bad trip, except a few times when I was with some bad people.
But it seems like, the more bad trips and paranoid/anxiety you get while smoking weed, it's like it adds up... So then whenever you smoke again after quitting for a little while, your body automatically activates the fight-or-flight response, based on your emotional memory of those bad trips, trying to prepare itself for an incoming bad trip. And so the cycle perpetuates itself.
Right now, even if I smoke some mid-grade stuff, with some equal parts of THC and CBD and other cannabinoids, I will get a little anxious, just before lighting up the joint..
That's why many people say that weed doesn't do it for them, that it makes them all anxious and paranoid after a couple of years, that it's not like in the beggining.
And this is why.