This paper reviews extant research in classical conditioning effects in consumer behavior and advertising contexts to determine whether they are real or illusory. The empirical results reveal that in cases where classical conditioning effects were found, they could be countermined by the deficiencies in research methodologies, demand artifacts, the mediating role of contingency awareness, or some alternative mechanisms. In cases where the effects were not observed, the failure could be attributed to violations of the conditions for classical conditioning to occur or absence of contingency and demand awareness. It is concluded that thus far there has been no convincing evidence for classical conditioning effects on consumer behavior. Suggestions for future research in this area are presented.