From: Jim Janecek

maybe I am wrong, but see a few flaws with your attempt to contruct a 
monstrous smoke ring generator.

1:  If you use a Venetian blind system, this will interfere with the 
toroid of air that comes out of the enclosure.   It needs a clean 
unobstructed hole to emanate from.

2:  The inflated structure is good idea and the flexible sides can 
also be used to generate the "oomph" that kicks the smoke ring out. 
Picture a pit under the center of the structure and a flexible 
membrane floor that gets pulled down by a weight.   Cut the weight 
loose and the interior volume decreases rapidly sending the smoke 
ring out the hole.

this is how many simple large smoke ring generators work.  Basically 
a large drum, it could even be a cardboard box with a hole in the 
side.  Fill it with smoke and then slap the back side with your hand.

There are many commercially available "fog" or "smoke" generators 
that can create vast amounts of "smoke" in a short period of time to 
fill the chamber.   I use one that was manufactured for mosquito 
abatement.  It's called a Jet Fogger and it puts out a huge amount of 
smoke very quickly from a hand-held device.

I personally own 2 "Golden Eagle" versions of these, more info at the 
manufacturer's website, including videos and specs:

http://www.dynafog.com/home.html