SANTA CLARA, Calif. -- Aldon Smith had his first full practice Wednesday since returning to the San Francisco 49ers after spending five weeks in a treatment center.The big question is whether Smith will play Sunday against Carolina. The 49ers are 5-0 without Smith. However, they have had just five sacks in the past four games. They had seven sacks when Smith played. He accounted for 4.5 of those.Still, don't expect much clarity on whether Smith will play.