Switching From Tobacco Smoking to Electronic Cigarettes and the Impact on Clozapine Levels Kocar, Thomas; Freudenmann, Roland W.; Spitzer, Manfred; More Kocar, Thomas; Freudenmann, Roland W.; Spitzer, Manfred; Graf, Heiko Less Journal of Clinical Psychopharmacology. 38(5):528-529, October 2018. Favorites PDF Get Content & Permissions Buy