There are, sadly, a lot of drooling idiots out there who will aim laser pointers at planes, cars, etc. It happens all the time.
You think some of them don't own 3D printers too?
As far as OSHA rules go, it depends very much upon the wavelength and accessibility to the laser beam or its reflections.
Anything that promotes the blink reflex and which is under a few milliwatts is relatively safe and may get a class 2 rating (class 1 is "safe"/shielded/inaccessible).
There are sub-variants on all the classifications.
Infrared (dangerous) or ultraviolet (very dangerous) are a different matter entirely and can merit class 3 or class 4 ratings even at miniscule power outputs because you can easily stare into them long enough to do damage without realizing it.
As far as actetone vapor finishing is concerned, I do it all the time and it is an almost magical process to see.
But, I never, never, never heat it, or do it in the house, or anything dumb like that.
I do the "cold" paper towel in a jar method, which takes longer, but works quite nicely.
Some of the parts I have processed in this manner are downright glossy.