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ihave done fish and other meats in same smokers and have never had anykind of fish odors. use common sense and clean up behind yourself a bit. i always like to take care of smoker after removing meats, seems to clean up better while still warm. once cooled have a more difficult time removing deposits, mt out water pan and clean and rinse drip pan out. now all set to go for next time as well.
Also...fish shouldn't smell fishy. Unless you're smoking a can of tuna...
Fresh fish is clean smelling, I wouldn't eat any fish that has a strong fish or bleach smell. It generally means it's old and time to be tossed.
Just wanted to let you know that you will have no problem with smell whatsoever. I have smoked my fare share of salmon and have never had a problem with smells. Good luck and enjoy the eskimo candy you are about to make