Your cannabinoid system uses the cannabinoids in cannabis because your body needs to repair itself. Weather its nerves,cells,or tissue that is injured.
Such as bruises,head trauma, blunt force to the body that is soreness, etc but then you get to the confusion of which strain does what? THC or CBD? It's all different and it all matters because it treats certain diseases/cancers/disorders/most commonly pain...
Now we go on to the part that people don't search for when they want the kind of cannabis that will help them.
You might be smoking the wrong strain buddy. Or you should convert to edibles or topical cream.
If your a perfectly healthy human you don't need the cannabinoids thus the neausa and diarrhea/hives etc
I think your making your self paranoid, and now a days people who never smoked weed before will smoke now, not because their body needs it, but to more so hop on the bandwagon..
People with natural born diseases/cancer/disorders need to have some sort of cannabinoid.
People with serious injuries that are currently healing should have cannabinoids.
People with past serious injuries, and I mean injuries that change them to never be the same should have some sort of cannabinoid, because we all know those serious injuries catch back up to us when we are older! So the cannabinoids speed up the healing proccess.
People who are perfectly healthy shouldn't smoke cannabis. Just my thought.
It's just an educated guess..please don't take my reply personal I'm trying to just help get ideas flowing/brainstorming and hopefully someone can come up with a source for all of this. I'm just going off the rip, winging it here. Because I'm not a scientist lol