In 2001, Smith was quoted as saying, "I started Home Improvement when I was 7, and the show ended when I was 16. I never had the chance to decide what I wanted to do with my life. When I was 16, I knew that I didn't want to act anymore." Aged 17, Smith married Heidi van Pelt on April 27, 2001. The marriage sparked much controversy due to the couple's age difference, as van Pelt was 16 years older. The couple filed for divorce on February 2, 2007.
In 2005, Smith and his then wife formed a California-based non-dairy cheese manufacturer and restaurant, Playfood, specializing in vegan and organic foods.
In 2014, he volunteered doing disaster relief with Communitere in the Philippines.
At 18, he gained control of his $1.5 million trust fund, which he accused his parents of squandering by purchasing themselves a mansion. His mother, Candi Bennici, stated in 2015, "Of course we didn’t touch his money... It was in a trust fund. We couldn’t have touched it if we wanted to. They were trying to get it when he was 17, and we were trying to protect it. Luckily the Marin courts were very good about it and didn’t give it to them". He later said, “I’d gotten out of the teenage phase and realized my parents weren’t doing anything wrong but were trying to protect me”
