I agree with manxman. I found smoking below 60 you don't get as much smoke penetration and adhesion, and though a few sources my state 100°F, most that I have seen use 90°F as the high limit.
I have cold smoked, salmon, cheese and vegetables at the same time, and if you use the cold smoke set up and keep the box at a temperature below 90°F, there will be no transfer of flavors. Always place the fish below any other product that is in the smoker and you should be alright.