Addiction plays a large mr part than simply dopamine flood, structures such as the insula and NAC are important in understanding specific addictions and are affected by NT receptors but are still not completely comprehended. Also THC(really impressed you spelled that out) primarily has an effect on dopaminergic neurons(that is in the NAC, not VTA.) Also it is a scientific fact that excess cannaboids in parts of the brain are detrimental to long term working memory(the hippocampus specifically)