They used a withdrawal symptom checklist to assess symptoms including appetite loss, mood, difficulty concentrating and irritability over five-day abstinence periods.
Assessment periods were separated by periods of at least nine days of usual substance use.
Authors found that withdrawal symptoms were similar, although subjects experienced more anger and craving when giving up smoking.
They write: ‘The results do suggest that the severity of the cannabis withdrawal syndrome is of comparable magnitude to that of the tobacco withdrawal syndrome.’
Drug and Alcohol Dependence (2008) 82: 48-54