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a–d Scatterplots showing the extent to which cigarettes per week (uptake) and smoking urges factor 1 (craving) predict percent tobacco responses in the concurrent choice task (drug-seeking) and number of puffs consumed in the ad libitum smoking session (drug-taking). e–j Scatterplots showing the extent to which Barratt Impulsivity Scales (BIS) predict the drug-seeking and drug-taking measures
