RT Journal Article
T1 Explaining Avoidance of Simultaneous Alcohol and Cannabis Use: An Extended Theory of Planned Behavior Model Including Non‑deliberative Processes
A1 Valle del Vera, Belén
A1 Parrado González, Alberto
A1 Carmona Márquez, José
A1 Fernández Calderón, Fermín
AB Simultaneous alcohol and cannabis use (SAC) poses greater health risks than using each substance separately or concurrently. This two-wave prospective study examined (1) the Theory of Planned Behavior (TPB) capacity to explain the frequency of avoiding SAC use; (2) whether adding past behavior and habit strength—non-deliberative processes—improved prediction; and (3) model invariance across sex and college status. A community sample of 378 young adults (60.3% men, Mage = 21.02, SD = 2.12) completed baseline and 3-month follow-up questionnaires. The TPB explained 55.9% of the variance in intention  and 31.4% in behavior. Adding habit strength and past behavior raised explained variance to 73.6% and 49.9%. These non-deliberative factors were the strongest predictors, reducing the effect of traditional TPB components. The model’s predictive capacity was invariant across gender and educational status. While the TPB provides a strong framework for understanding health-promoting behaviors, our results highlight the importance of considering both automatic and reasoned processes.
PB Springer
SN 1557-1874
SN 1557-1882 (electrónico)
YR 2025
FD 2025
LK https://hdl.handle.net/10272/27675
UL https://hdl.handle.net/10272/27675
LA eng
NO del Vera, B. V., Parrado-González, A., Carmona-Márquez, J., & Fernández-Calderón, F. (2025). Explaining Avoidance of Simultaneous Alcohol and Cannabis Use: An Extended Theory of Planned Behavior Model Including Non-deliberative Processes. International Journal of Mental Health and Addiction. https://doi.org/10.1007/s11469-025-01567-2
NO Funding for open access publishing: Universidad de Huelva/CBUA This work was funded by the Agencia Estatal de Investigación (Ministerio de Ciencia, Innovación y Universidades, Spain; MICIU/AEI//10.13039/501100011033/) under grant number PID2020-118229RB-I00 granted to Fermín Fernández Calderón.
DS Repositorio Institucional de la Universidad de Huelva
RD 31 may 2026