I have to say that I am now in the 220+ camp now.
Hot smoked salmon.. I have done a few..
I read a post that said to do it at 170 and that did not work for my #2 at all. It took 4+ hours in the cold weather of 40 degrees. No need for that noise.
Crank it up higher to 220 or so and pull it at 140 and tent it for a half hour and it will be great for hot smoked salmon. I get my fish from SAMs and use maple wood about 2.5 to 2.75 oz. It may be a bit much so you may wish to go to 1.5 or 2.0, but my family like it kind of smokey. Maple and the brown sugar makes it a bit sweet.
I see no reason to smoke hot salmon for more than 2 hours.
Cold smoking is a different cook though. You will need to go very low and smoke for many hours below 70-80F. Yes, it can take a day, so sit back and experiment with the salt cure and smoke. I have to say that the cold smoke is the best in my opinion.
Bill.