In my experience, is not just about the strain. A very important thing is the dose and the via of administration. I had heavy panic attacks so I studied myself. I discovered that when I smoke my respiratory system goes irritated and contracts, I cant breath normally. Plus more than three hits of a good quality harvest is too much for me. When I smoke I cant breath normally but at the same time my cells needs more air because Im high, I feel that my body when Im high needs more air but with my respiratory system contracted I cant breath the air that I need. A week ago I have my last panick attack after smoking five hits. I went outdoors, breath slowly and then I calm myself down. Because of that I will buy a vaporizer because after smoking my voice crash and I cant breath. Im pretty sure that with a good vaporizer you will not get the panick attacks if you dont overdose because your respiratory system would breath without issues.
English is not my native language but I trying to say this: when you smoke you need good fresh air for your body but your irritated respiratory system cant breath very good. In my case, that is what make feel me the panic attack.