The invention relates to a gas composition containing xenon gas for use in preventing the relapse of a patient who has been weaned from at least one psychotropic product which resulted in said patient becoming habituated, the xenon being administered to the patient by inhalation. The composition of the invention contains an effective volume proportion of xenon, in particular from 5 to 70% by volume of xenon. DRAWING: FIG. 5: Nombres de pression sur le levier/session Number of presses on the lever/session Levier respectif inactif Respective inactive lever rechute relapse
