My friend and girlfriend think it could actually be pesticides or something. It's really hit or miss if I react or not, and it's always to touching not ingesting. My friend grows his own and his never gets my allergies going. My girlfriends favorite dispensary also doesn't trigger me. Though other dispensaries where we got some "cheaper" weed my allergies get bad. It's also not just weed, I used to think I was allergic to apples but my allergy test confirmed ts not the apples. Still unsure what exactly it is though. Heck even going to an apple orchard even causes my hives to trigger.