Assessed, by a Morbidity Attitude Survey & Depression Scale, hard core heroin addicts (n=98) who were in either a methadone treatment or an abstinence program. Showed distinct evidence of depression among addicts compared with controls; greater incidence of suicide attempts, except in blacks; different attitudes toward violence & morbidity, particularly when abstaining from methadone; methadone appeared to be helpful while subjects were on it, but when abstaining its effects were in doubt.