Smart is the son of Billy Frank Smart and Camellia Smart, who died of myelodysplastic syndrome on September 16, 2018. He has three older brothers: Todd Westbrook (deceased), Jeff Westbrook, and Michael Smart. He attended Edward S. Marcus High School in Flower Mound, Texas, along with one of his future Oklahoma State teammates, Phillip Forte. During his senior year, Smart averaged 15. 1 points, 9. 2 rebounds and 5 assists. In his high school career, he achieved a record of 115–6 through three seasons and was a two-time 5A state champion. He was also named a McDonald's All-American and was an ESPNHS first team All-American. Smart played competitive football until the sixth grade and enjoys playing tennis in his spare time.
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