A computerized version of DIS-IV was administered at baseline to both the chronic smoker and depressed smoker samples. Each of the seven DSM-IV nicotine dependence criteria was assessed as being either present or absent in the past year with this instrument. Consistent with the DSM-IV, participants were diagnosed as nicotine-dependent if they reported experiencing three or more of the seven nicotine dependence symptoms in the past year. Participants were diagnosed with nicotine withdrawal if they endorsed the characteristic nicotine withdrawal syndrome or if they reported using nicotine to relieve or avoid withdrawal symptoms.
