I have hunted bear in Quebec with and without the thermacell. It definitely makes sitting in a stand easier.
But don’t forget the head net and gloves. Tape your pants to your boots. Tape your gloves to your sleeves.
I use a net I bought in Quebec. You can’t get it in the states. It has the shirt and head net built together. Costs about 25 dollars and is available in all the sporting good stores up there.
You can’t bring the fuel canisters with you on the airplane. You will need to buy them in canada. Go to Canadian Tire and look in the hair curler section. The same butane cartridges used for cordless hair curlers works for the thermacell, and is a lot cheaper.