Aldon Smith says he's not worried about rust in his NFL comeback -- telling TMZ Sports he feels young, healthy and "blessed by God."
The 30-year-old pass-rusher was reinstated by the NFL after 5 years out of pro football due to several off-the-field issues including arrests stemming from substance abuse.
But, Smith -- a former 1st All-Pro -- says he's now clean and sober and focused on football. In fact, he's been busting his ass in L.A. with Jay Glazer and recently signed a 1-year deal with the Dallas Cowboys.