Hank -
I can relate as both a hobbyist that generally just uses my laser gear in small "venues" (i.e. inside the home, in the garage, etc.), and also as someone dealing with asthma.
(Mine is severe enough that it knocked me out of a 20-year career flying for the military...)
Since I really started acquiring laser gear after my health issues were already known, I had to tread carefully when considering fog machines.
Thankfully - and with medical advice backing me up - I have been able to enjoy all my gear, and as long as I "play it smart", generally don't have any issues being around most fog machines.
I have always used a water based fogger - actually, an Antari Z300 "fazer" - and it both provides MORE than enough "ambience", and as long as I use readily-available name-brand fluids, is fairly easy for me to tolerate.
(I have used "Black Label" fog fluid- available at Guitar Center - and "Froggy's" fog fluid ordered online, and both have worked just fine for me. The odor from either one is minimal)
A few key points for our use:
* Use sparingly, both for ambience sake (too much fog makes the beams look like crap), and allergy & asthma sufferers can tolerate it better.
At the very least, get a fogger with controls that lets you limit the volume and frequency of the fog, and only generate fog when needed.
DMX controls are nice, but not really needed, IMHO ~
Many of the machines have wired or wirless remotes that will let youy place the machine a considerable distance from the operator if needed.
In a typical room in a house, a little fog will generally last and go a long way.
If needed, an open window will usually quickly dissipate any residual fog and odor that might be lingering after the machine is shut down.
* Use a fan blowing TOWARDS the fog outlet of the machine - even if using a "fazer" - to help dissipate the fog plume and make it more suitable for tight quarters.
* Put a plastic shower cap over any exposed smoke alarms prior to running the fog / haze, and be sure to remove it when the laser session is done!!
(Helps keep the local Fire Department away if you happen to use too much fog ~ just ask my wife how much fun THOSE visits are!!
)
* I always use a cheap door mat to hold my fog machine, instead of placing directly on the floor or carpet.
This would help contain any spills or (unlikely) leaks from the machine, plus the mat can catch any "spit" from the fog outlet (happens occasionally...)
I have found that for home use - even if running lasers all night in a garage - I rarely wind up using even a full tank of fog fluid to get me through the night.
For fairly small enclosed areas, you generally don't wind up using that much fluid, even with a regular fog machine.
All this said, I just purchased a Chauvet Haze 3D (still water-based), primarily with the hopes that it might open up some possibilites for doing some shows in some small venues that frown upon "fog machines".
I haven't had the chance to try it out yet, but since my current "laser studio" is a one-bedroom apartment, I figure that will be a good test for it!!
And yes, it is WAY overkill for the shows I would normally hold in my home and / or garage in Knoxville!! 
Randy
Last edited by Stuka; 08-26-2014 at 12:30.
RR
Metrologic HeNe 3.3mw Modulated laser, 2 Radio Shack motors, and a broken mirror.
1979.
Sweet.....