Do mortars get ROF with SMOKE?
Yes they do. MTRs are the only weapon type that can maintain ROF when using the Area Target Type. Since the ATT is always used when firing SMOKE, MTRs may fire SMOKE and keep ROF. As a point of trivia, this was not the original intention behind the SMOKE rules. However, so many people were playing it this way that TAHGC felt that it would be counter-productive to issue errata to stop the tactic. Hence, MTRs are valuable SMOKE-producers in the game.