"Natural" is one of those buzzwords that people like for irrational reasons. There's a popular delusion that natural things are harmless things, and that synthetic chemicals are inherently unhealthy. Even though lead, arsenic, uranium and cyanide can be found in nature, and our most effective pharmaceutical drugs are synthesized in laboratories.

Just because a product is made of 100% natural ingredients doesn't mean it's any healthier for you. You wouldn't walk into your backyard and just start eating everything natural assuming it's all good for you. You're likely to get very sick doing that.

It is true that cannabis is natural and that cannabis is pretty much harmless, but those two facts are not necessarily related. Synthetic THC is just as harmless if not more so, and cannabis with naturally growing mold on it could cause serious medical problems.