"This study validated several specific effects of
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These withdrawal effects appear similar in type and magnitude to those observed in studies of nicotine withdrawal [...]
Craving for marijuana, decreased appetite, sleep difficulty, and weight loss reliably changed across the smoking and abstinence phases. Aggression, anger, irritability, restlessness, and strange dreams increased significantly during one abstinence phase, but not the other."
--Alan J. Budney, PhD et al.
Professor, University of Arkansas Center for Addiction Research
"Marijuana Abstinence Effects in Marijuana Smokers Maintained in Their Home Environment"
Archives of General Psychiatry
Oct. 2001