I'm sure it is not a habit you are trying to get out of ....so I am going to go ahead on the assumption that you are experiencing a burning sensation in your toes.....it could be that you have got something like Athlete's Foot (fungal infection) very treatable ....are your toes itchy?
Burning toes can be a symptom of a number of things. I suggest that you seek prompt medical attention to ascertain the cause so that you can receive appropriate treatment. If this sensation continues, and you can rule out causes like too tight shoes, get to your doctors.