To understand the reasoning behind substance abuse, we have to look at it from economic and psychological aspects, which brings us to the behavioral economic theory of substance abuse. It represents the reinforcers and contingencies, whether endogenous, as a subjective response to drugs, stress or arousal, or exogenous, which are the environmental factors such as low availability of alternatives, low prices of substances, social contexts that promote substance use, as well as life events that cause stress or dysphoria, that push the individual toward making cost-benefit decisions (Murphy & Dennhardt, 2016).