it might be the strand you smoke, or maybe ur body just doenst like it. I get headaches sometimes, but tahts usually when im around the smoke for a long time, like in a hotbox.

Try smoking it a different way. Make a lightbulb vaporizer (google it) and you wont even be smoking it so if the smoke is the problem, that will cure it. When I use my vaporizer i have no headache whatsoever and no adverse feelings at all, its so great. I guess its the smoke that makes me feel sick.