Recent quotes:

Pot withdrawal eased for dependent users | YaleNews

Withdrawal symptoms are marked by craving for marijuana, irritability, anger, depression, insomnia, and decrease in appetite and weight. In 2015, about 4 million people in the United States met the diagnostic criteria for a cannabis use disorder, and almost 150,000 voluntarily sought treatment for their cannabis use. According to recent national data, approximately one-third of all current cannabis users meet diagnostic criteria for CUD.

Department of Health | The amphetamine withdrawal syndrome

Animal and human studies have confirmed that the methamphetamine withdrawal syndrome may be protracted (the mood disturbance may last up to a year in some cases) and tends to be more severe than cocaine withdrawal (see Cho & Melega, 2002 for a thorough review; Davidson et al., 2001; Volkow, Chang, Wang, Fowler, Franceschi et al., 2001). Similarly, there is some evidence to suggest that individuals who have experienced a methamphetamine-related psychosis are at risk of further psychotic episodes, even in the absence of further psychostimulant use (Yui, Ikemoto, Ishiguro & Goto, 2000).