SANTA CLARA, Calif. -- Aldon Smith said Tuesday it is "crossing his mind" about playing Sunday against Carolina after spending five weeks in a treatment center.The 49ers will not push him, but there is no doubt the 49ers need him back on the field.The 49ers have had a difficult time finding a consistent pass rush. Even though the defense is a big reason they won all five games while Smith was away from the team. The 49ers had a total of five sacks in the past four games.