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To Drive or Not to Drive: The Dose-Response Effect of Driving Latency on Cannabis Use
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Abstract
Controlled studies show that cannabis use impairs driving and may raise crash risk. Behavioral economists have recently used marijuana purchase tasks (MPTs) to examine driving after cannabis use (DACU). One key factor is the time between smoking and driving. A crowdsourced sample of monthly cannabis users (n = 167; 77% White; 45% women; mean age = 38.55) completed four MPTs based on vignettes with varying delays between smoking and driving (no driving; 20 min; 1 hr; 6 hrs). Participants also reported DACU frequency and perceived risk. Demand was measured via intensity (consumption when free), breakpoint (last price with consumption), Omax (max spending), and Pmax (price at Omax). Repeated measures ANOVAs found main effects of latency on all demand indices (ps<.001), with lower demand in all DACU scenarios compared to the no-driving scenario (ps<.015; ds = .09–1.52). Demand rose linearly with longer delays. Those with DACU history showed smaller reductions in demand (except breakpoint) at each delay than those without (ps<.043; ηp² = .008–.043). Higher perceived danger was linked to lower demand (except breakpoint) (rs = -.29 to -.62, ps<.05). Cannabis demand is influenced by driving-related factors, and latency and risk perceptions may help explain these effects. More research is needed to explore other influences on DACU, like consumption methods or road conditions.
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This poster was presented at Collaborative Perspectives on Addiction on 04/04/2025.
Date
2025-04-04
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University of Kansas
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Keywords
behavioral economics, cannabis, demand, driving, reinforcement