I make my own sausage a lot. However I've never smoked any, just cooked them on the cast iron pan. If I plan on smoking sausage, do I need to add a cure?
Depends on what you mean by smoking them. If you are smoking them right away above say 220* in order to fully cook them and then eat them, then no cure is needed.
If you are smoking them at very low temps in order to cure them, then yes a Cure #1 is needed.
Not if you are smoking them hot....200* or so. If you are smoking at lower temps and gradually raising the temp, then yes. I smoke (cured sausage) at 130 and then raise the temp gradually. I rarely go over 170. I pull at 152 for a "fully cooked". I do sometimes pull at 130-140 with the intention of grilling them at later dates.