Anyone ever seen this? Smoke candle test. I have and only once for duct detectors. Aerosol wouldnt make it down the duct. We had to put it near the return air grate and reset the system and do it at all of the other DD's to test if the sample tubes were working properly.
And, yep, its true, you can destroy a smoke by spraying the stuff too close. I have also had inspectors who are OK with just the test button (if it has one, most addressable systems don't), but an equal amount of those who want to see full operation at each device, and want to test supervision, by pulling wires out, with the right address called back to them.