BACKGROUND & AIM: To find safe and effective bio - antimutagenic resources for the prevention of tumor and the reduction of the genetic damage of CSC (Cigarette Smoke Condensate) .MATERIAL AND METHODS: The antimutagenic effect of AMH (Antimutagenic Herb) on CSC was studied by the revised Ames test.RESULTS: Ames test showed CSC was a shamshelft mutagen,and AMH could significantly inhibit the mutagenicity of CSC(P < 0.01). The highest inhibitory rates of the revertant colonies induced by CSC in strains TA97 a...