His first major television role came in the television series Party Animals, a BBC television drama series about fictional parliamentary advisors and researchers in Westminster.
When she is finally pulled away from him to go to rehab, his identity collapses. Upon its transfer to the West End, Smith's performance as Henry was highlighted as one of the positive aspects of the play by critics for the Evening Standard, Daily Express, The Guardian, and The Times.
"I think glasses are definitely cute, but I really like intelligent men.
Smith initially aspired to be a professional footballer, but spondylolysis forced him out of the sport.
After joining the National Youth Theatre and studying drama and creative writing at the University of East Anglia, he became an actor in 2003, performing in plays like Murder in the Cathedral, Fresh Kills, The History Boys, and On the Shore of the Wide World in London theatres.
As Henry, Smith portrayed an aspiring artist who left school to take care of his mother.