Smith is the youngest of four siblings and the only male. His mother, Sheridan, is a former model, and his father, Dallon, is a hobbyist musician who started a guitar-string company. He grew up in the small town of Spanish Fork, Utah.[6] He was scouted with his three sisters in Utah when he was 10 and began his career when he was 12. Upon being signed with Next Management, he and the entire Smith family moved to Los Angeles where the younger children were homeschooled. Shortly after their arrival, Smith and his siblings were photographed by Hedi Slimane for Vogue Homme Japan which generated immediate attention.

Smith’s modeling career especially took off after he dyed his hair platinum blond at his agent’s advice. By 2015, he had shot a dozen magazine covers and fronted fashion campaigns for Philipp Plein and Tom Ford. He and several other models appeared in Tom Ford’s fashion video with Lady Gaga for SS16.

He has appeared in advertising campaigns for Tom Ford, Calvin Klein, Moncler, Tommy Hilfiger, Philipp Plein, Mavi, Penshoppe, H&M, Gap, Big C and L’Oreal.