Age-Structured Single-State Drug Initiation Model — Drug Epidemics and Optimization of Prevention Programs * Christian Almeder † , Gustav Feichtinger, and Gernot Tragler Vienna University of Technology Department of Operations Research and Systems Theory 27th December 2000 * This research was partly financed by the Jubil¨aumsfond of the ¨ Osterreichischen Na- tionalbank under contract No. 8466 † Argentinierstraße 8/119, A-1040 Vienna, Austria; email: calmeder@eos.tuwien.ac.at 1