Hey, imhungry! Glad to have you here.
Seasoning a smoker is mainly done to prevent rust for building up on the inside of your smoker. Take a good quality vegetable oil (I use canola oil) wipe down the interior of your smoker (some will use lard or bacon grease) and fire that puppy up. Check your smoker manual-different brands have a recommended temp. for seasoning the smoker. Basically, the oil burns into the open pores of the metal and forms a carbon layer that will protect the metal from rust.
Hope this answers your seasoning question.