Single- and cross-commodity delay discounting of money and e-cigarette liquid in experienced e-cigarette users. (1st January 2020)

• Record Type: Journal Article
• Authors: Pericot-Valverde, Irene; Yoon, Jin H.; Gaalema, Diann E.
• Is Part Of: Drug and alcohol dependence. Volume 206(2020)
• Publication Date: 2020-01-01
• Subjects: Delay discounting -- Cross-commodity discounting -- Single-commodity discounting -- E-cigarettes -- Impulsivity; Drug abuse -- Periodicals; Alcoholism -- Periodicals; 616.86
• DOI: 10.1016/j.drugalcdep.2019.107740
• Languages: English
• ISSNs: 0376-8716

Abstract

Highlights: E-cigarette liquid was discounted at a steeper rate than money. E-cigarette users discount mL vs. mL, M vs. M, and mL vs. M in descending order. Significant correlations between SCD and CCD discounting rates were found. Both SCD tasks were significantly associated with attempts to quit vaping. Abstract: Background: Delay discounting (DD) research has improved our understanding of important behavioral processes associated with tobacco use. Little research has explored DD among e-cigarette users, and these studies have exclusively examined money as the only available commodity. This secondary analysis of a laboratory study explored discounting for money and e-liquid among e-cigarette users using two single-commodity discounting (SCD) tasks and one cross-commodity discounting (CCD) task. A secondary goal was to explore the extent to which results from the SCD and CCD tasks were correlated to each other and with measures of e-cigarette use. Methods: E-cigarette users ( N = 27) completed two SCD tasks and one CCD task. The SCD tasks assessed choices between various amounts of either money now versus money later (M-M) or e-liquid now versus e-liquid later (mL-mL). The CCD task assessed choices between e-liquid now versus money later (mL-M). Discounting results were compared using log k and AUClog. Results: Discounting was greatest in the mL-mL task, followed by the M-M task, and then the mL-M task. AUClog and log k were significantly correlated across all discounting tasks. Attempts to quit vaping was positively associated with log k and negatively associated with AUClog and in both SCD tasks. Conclusions: E-cigarette users discount e-liquid more than money in a SCD task. However, when the two commodities, money and e-liquid (CCD), are compared the substance of abuse is discounted to a lesser extent. Interventions that provide alternative reinforcers to compete with the reinforcing effects of nicotine intake may be especially indicated for treating e-cigarette dependence.