I also agree with the theory that a rabbit wont bolt with smoke
Although a keen ferreter . i thought i wud have a go anyway
i peg the warren holes with purse nets
then got a rubber glovee on stick , set it a light put it far down a hole as i could then covered the fire holewith a piece of wood then wait the black smoke will soon start to leak out of the other holes and through the nets.
but ye it proves for me anyway that rabbits ont bolt with smoke get a good female ferret down there instead then u will have tight nets all day.
thanks.