Balloon-Task Risk Taking Had an Overall Time Effect Without a Group Interaction
Balloon-task scores changed across sessions, but the study did not find a significant session-by-use-group interaction. That pattern differs from claiming that occasional and frequent smokers showed demonstrably different THC effects on risk taking.
The outcome was adjusted balloon pumps
Participants earned small monetary amounts by inflating virtual balloons while risking loss of the temporary reward if a balloon popped. The primary score averaged pumps on balloons that did not pop. The task provided a controlled proxy for risk-related decisions, not a direct record of unsafe driving.
The statistical findings were mixed
The authors reported an overall increase across sessions in adjusted pumps, with no significant group or session-by-group interaction. Specific contrasts did not establish a significant difference from baseline, although a late trend was described. The study had no placebo smoking session, so time, practice and other session influences could not be cleanly separated from drug effects.
Keep task and real-world conclusions apart
This result does not demonstrate that cannabis never changes risky decisions. It also cannot establish that a higher score proves dangerous conduct outside the laboratory. The small groups, missing observations and specific reward structure limit generalization. The study’s clearer group differences in other domains should not be transferred automatically to this risk-taking endpoint.
Related analysis: blood THC and task effects across use groups.
Research cited
Desrosiers and colleagues (2015). Smoked Cannabis’ Psychomotor and Neurocognitive Effects in Occasional and Frequent Smokers. DOI: 10.1093/jat/bkv012.
