Try a road flare instead of a smoke bomb. As long as you can find and cove all the holes. Leave on open and light the flare place it as far down the hole as possible. Then place a rock about the size of the hole down near the flare. Fill the hole in with dirt. The rock stops the dirt from putting out the flare. No more G-hog. The flare puts out enough smoke to displace the oxygen in the hole I have done this in place where I could not shot them or a visible trap would be a problem Tree hugger/ neighborhoods.
