With the discussion of risks of forest fires and the ability, and difficulty to obtain commercial grade smoke, for ventilation system inspection.
Enola Gaye Fireworks company from the UK has a solution for airsofters.
Previously difficult to privately import these into Canada. We now have a supplier, I already assume people know this or of another company. However I am trying to help spread the word.
They also make a flash bang, currently new as of last year and I assume will take some time and paper work to import them into the country. For now though we have Smoke, at a affordable price.
What is a Enola Gaye Smoke Grenade, and how effective is it?
Here is a list of two suppliers from Google.
and of course their official website