The progression of a long-term exposure to drugs toward the development of substance use disorders and addicted behaviors is often associated with deficits in decision making (Koob and Volkow, 2010; Wiers et al, 2007). FMRI demonstrates altered brain activity in core regions linked to the motivational and affective aspects of decision making (Cousijn et al, 2012; Vaidya et al, 2012), mainly in the ventromedial prefrontal (VMPFC) and orbitofrontal cortices and insula. In this regard, it has been demonstrated that substance-dependent individuals and patients with VMPFC lesions exhibit similar behaviors that lead them to make similar decisions in real life, preferring choices that bring immediate benefits even if coupled with negative consequences (Bechara and Damasio, 2002).
In our study, we complement the functional evidence of altered activity in nodes related to decision making by showing in regular cannabis users a decrease in gray matter volume in the insula, orbitofrontal cortex, and precuneus, regions that are part of the motivational and affective components of this network.
THC is only part of the story. If you change this to cannabinoids in general I'd be more inclined to agree. CBD in particular is very important to regulate balance out the negative aspects of THC.
How about making THC widely available and restricting alcohol?