I've been smoking for about 7 years now, around a half a month. All weed I buy is TOP quality, always the best from dispensaries shipped over here. The problem is I've NEVER been able to smoke a lot at once. For example I can smoke a few bowls THROUGH the day, but I can't smoke a few bowls or a joint at once without getting a HORRIBLE migraine/headache, it differs, sometimes a migraine, sometimes a headache. I do have some sinus issues, and I doubt it's allergy issues since the weed is always different strains and types each month, but it could be. I can't smoke oil from a bong without getting a headache, but I can in a bowl. I haven't tried edibles or vaporizing a lot of weed in a few years so I'm unsure about that, but perhaps let's say I couldn't do those either, then I'd assume it's some kind of chemical imbalance or a neurological issue, otherwise it'd be dehydration, sinus, and allergies perhaps? Any insight would be appreciated, I can never smoke a lot with my friends and they always do joint after joint when I can only do 1 hit here and there.. I would have to say my tolerance never really raises too much also.