I've had my WSM for approximately 5 months. I've smoked salmon at least twice, scallops at least twice, and grouper once, so we're talking smoking fish at least once a month. I always foil, so maybe that's why, but I have never detected any hint of fish odor when it has come time for the next cook. And I've had multiple people tell me "that was the best turkey/chicken/pulled pork/ribs I've ever tasted." I would imagine that for competitions, maybe there's some extremely slight difference that it makes, but neither I nor any of my family members or friends have noticed any issues.