Sounds like you may have had a reaction to this variety of herb, but more likely this herb didn't get flushed well enough before harvest and had some nitrates left over in it. Some folk are very sensitive and it doesn't take very much when smoking. If your herb didn't burn smooth leaving only gray ash with no snap crackle or pop, still has some fert in it. Let us pray this is a one time thing, MMJ is truely a miracle for me too, hope this helps.