[0] Lived experience [1] Gorelick DA, Levin KH, Copersino ML, Heishman SJ, Liu F, Boggs DL, & Kelly DL (2012). Diagnostic criteria for cannabis withdrawal syndrome. Drug and alcohol dependence, 123 (1-3), 141-7 PMID: 22153944

I'm sure you can search around and find a lot more, there is a growing understanding/acceptance that it exists.