^^^^^^^ What he said about the canned smoke
Also, be very aware that if you have fans on your projector you'll risk sucking in the canned smoke. Unless you have a fully sealed optics chamber it will coat all of your optics
I use my unique hazer indoor without any problem (or latent smell). Just don't set it going with the fan and pump on 100%, I did this once and within seconds you couldn't see an inch in front of your face