Ever since Florida legalized medical marijuana, those of us who work in the emergency department have seen an alarming uptick in people coming in with complaints of nonstop vomiting. If you ask, they will usually admit to you that they smoke marijuana. Those who won’t admit it always show it on toxicology screens.
The syndrome that is responsible for this is Cannabinoid Hyperemesis Syndrome, or CHS. This is a fairly new thing that has been becoming more and more of a thing since the legalization of marijuana has gained steam across the country.
Go red the whole thing.
I am not going to stand here and say I was a drug-free angel in my youth, but dear sweet lizards, what kind of shit are people smoking nowadays? You are supposed to get the munchies not tossing them with projectile vomiting and then sous-vide yourself for relief.
This makes getting shitfaced with alternative shots Fire Ball and Jagermeister a valid and healthier option.
There is a qualitative difference between 2% THC and 22% THC.
As Boris points out, the concentration of active ingredients is way higher than in decades past. I don't remember the numbers but the impression I have is that it's at least a factor of 10, perhaps much more than that. So it's a bit like substituting a glass of Everclear for the glass of beer you're used to.
Apart from that, given the marginal legality of all this stuff, you don't have any good reason to believe in the purity of what you're sold. Who knows what kind of pollutants might be mixed into your weed by the various lowlifes in the distribution chain?