Cold Smoking hard boiled eggs will provide a nice smoke flavor and maintain the integrity of the egg. Hot smoking typically over cooks the eggs making them rubbery and dry. Best to team this up with cold smoking other foods such as salmon and bacon. Some people will soak the eggs in a brine or tea for additional flavor. Separate a portion of brine from other foods to avoid cross contamination. Smoked eggs can be used just like a plain old boild egg.