Impulsivity as a moderator of the intention-behavior relationship for illicit drug use in patients undergoing treatment

► We examine impulsivity as a moderator of the intention-behavior gap in drug abuse. ► We observed an intention-behavior gap for drug use patterns in opiate abusers. ► Two facets of impulsivity moderated the intention-behavior gap for drug use. ► High sensation seeking or low premeditation predicted a larger intention-behavior gap. ► Results have implications for the potential failure of MET strategies.