The Bradley hose is an odd size, it's between 4.75" - 5" in diameter, so you will need a 5" hose if you are replacing the hose on the Bradley Cold Smoke Adapter.
Maybe you can find or get an adapter made to go from 5" to 4" and then use a heavy duty dryer vent hose like I use. Just a thought.
I haven't checked the internet yet, but I've looked in local hardware and big box stores. The closest I could find was an adapter for 6" to 4".
Manxman;
I recall that conversation. Not only the length is a problem, but the flexible metal hose was not flexible enough.
KevinG,
New out of the package there may be a slight plastic odor, but if you have concerns just season the hose prior to placing anything in the smoker. I haven't use a fully plastic hose. In my area they mainly sell the laminated foil hose. That is aluminum foil, laminated between two sheets of clear plastic.

Click to enlarge.
Laminated foil hose.