Hi Peter
I see no problem at all in re-freezing after smoking as you have in effect proccesed the fish so every thing should be ok
Also please see the stament below from the "University of Wisconsin Sea Grant Institute"
The website can be found on the link below
http://www.seagrant.wisc.edu/greatlakes ... ezing.htmlRefreezing Fish
Is it safe to refreeze fish that has been previously frozen and then thawed?
If the fish has been thawed and handled properly (in the refrigerator, not at room temperature), refreezing will not introduce any new food safety risks. (See the above section for proper thawing technique.) However, the process of thawing and refreezing can cause toughening, loss of flavor, and other food-quality problems.
Hope this helps
regards
sausagemaker