What if it's just liquid gelatin? People eat it. What's wrong with spraying a gummy bear onto someone?

Your lungs don't eat liquid gelatin.

Ever stand at a crosswalk on a busy street? You are inhaling brake dust from the pads. You know what brake pad dust is made out of? Asbestos.

Go on, tell me particles in your lungs are trivial. Let me know if you still think that after you are 50+

Some quick googling indicates that asbestos brake pads are pretty rare these days (USA). Still can be a concern for mechanics who clean brake dust with compressed air though.