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The present study evaluated a new 30-day Web-based contingency management program for smoking abstinence with 4 daily-smoking adolescents. Participants made 3 daily video recordings of themselves giving breath carbon monoxide (CO) samples at home that were sent electronically to study personnel. Using a reversal design, participants could earn money for continued abstinence during the treatment phases (CO # 5 ppm). All participants were compliant with the treatment (submitting 97.2 % of samples), and all achieved prolonged abstinence from smoking. DESCRIPTORS: adolescents, cigarette smoking, contingency management, drug absti-nence treatmen