Clean the surface with TSP, Purple Power, or Krud Kutter before you attempt to repaint. Then apply a deglosser if you don't want to sand it. The smoke may be coming from insufficient curing time. Check the manufacturer's information on cure time. You are most likely driving uncured, unbonded resins out of the film at the high temperature and it will never cure properly as a result. It usually takes about 7-14 days for a full cure even after the paint dries before the resins fully bond with the solids and build a tenacious film.