Hi
I have succesfully cold smoked 3 whole salmon using the bradley smoker.
I placed ice cubes in the bottom "diffuser plate" half hour before smoking which cools the smoker, the smoker is then turned on allowing the smoke to pass over the ice and once a good head of smoke is achieved and the biscuits smouldering nicely turn off the smoker. The biscket carries on smouldering but the temperature surrounding the salmon did not go above 30 C.
The temperature/smoke can be controlled by unplugging the unit as the temperature rises and plugged in as it drops.
I unplug the unit as I believe the biscuit tray stays hot even when the unit is switched off.
Hope this helps
Ian