Smétanine first represented France at the 2004 Summer Paralympics in Athens, winning a bronze medal in the 50 metre freestyle event in his category. At the 2008 Summer Paralympics, he won gold in the 100 metre freestyle event and gold in the 50m freestyle, as well as two silver, in the 50m backstroke and 200m freestyle. At the 2012 Games, he won two silver and a bronze.