Evaluations were obtained with the same questionnaire item in 1968, 1969, 1970, and 1972 at Carnegie-Mellon University. The evaluations of marijuana and LSD experiences reported in 1968 were very similar to those at California Institute of Technology in 1967. Evaluations varied by drug, but were predominantly "beneficial and helpful" (marijuana, hallucinogens, tranquilizers/barbiturates), or "no particular effect" (amphetamines, beer, liquor, tobacco, narcotics). In the class of 1972, evaluations were positively related to number of usage experiences, and remained steady over time for all drugs except hallucinogens; these were seen less positively in later surveys. More negative experiences resulted from hallucinogen use than from any other drug. Statements about drug effects were evaluated by the subjects in terms of their own experiences and expectations and those of their peers. Counselors and educators should be aware that most drug-related experiences are viewed by students as either beneficial or neutral. (Author/PC)