[Age and toxicopathy--Vaud 1977-1978].

Recent work on principles of pleasure and on endogenous opioïd system enlightens some regulations of mental comfort and of homeostasis of the nervous system. From this point of view, the choice of specific drugs, during the first months of their use, would give an indirect picture of the troubles which caused initially the use of these substances. The present study discloses, behind the apparent anarchy of mono- and polytoxicopathies, some constant relations between age and sex of drug-users and specific choice of drugs.