He's the second player to leave the program recently. Junior guard Tyler Lamb said last weekend that he would transfer to another school to pursue more playing time.
Smith said he's leaving the Bruins for "personal reasons," although he said he enjoyed his two-plus seasons with the program.
The junior averaged 5.2 points and 4.2 rebounds while playing 13.5 minutes a game in UCLA's six games this season.
Coach Ben Howland called Smith "a fine young man who has meant a lot to this program."
Smith started 24 of 65 games during his first two seasons, which were marked by struggles with weight and conditioning.
Smith is a graduate of Kentwood High School. He led the Conquerors to the Class 4A state title in 2009. They beat Jackson in the title game.
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