Pork Loin would not be my first choice.(very lean) Smokers do great with fatty cuts of meat like Brisket or Shoulder or Ribs.
The long slow cooking times break down the meat and make it tender. Briskets used to be the choice of smokers,(they were .70 a lb) but smokers have made even the roughest cuts of meat expensive. You can also smoke veggies and Chicken. Lots of fun ahead.
"Forgiveness is between them and God. It's my job to arrange the meeting"