大麻は安いのか？ 大麻の需要と実験室での購入との相関関係

科学分野:

• Addiction Science
• Behavioral Economics
• Psychopharmacology

背景:

• The Marijuana Purchase Task (MPT) is a standard method for assessing hypothetical cannabis demand.
• Cannabis demand is linked to various outcomes, including use frequency and craving.
• This study investigated the relationship between hypothetical MPT performance and actual in-laboratory cannabis consumption.

研究 の 目的:

• To assess the validity of the Marijuana Purchase Task (MPT) for measuring hypothetical cannabis demand.
• To compare hypothetical cannabis demand with actual in-vivo cannabis self-administration in a laboratory setting.
• To determine if self-reported anticipated consumption predicts actual cannabis intake.

主な方法:

• Ninety-two individuals using cannabis at least twice weekly participated.
• Participants completed both Hypothetical and Actual Marijuana Purchase Tasks (MPTs).
• A randomly selected trial from the Actual MPT determined the amount of cannabis participants could smoke in a 1-hour session.

主要な成果:

• Cannabis consumption preferences showed high similarity between Hypothetical and Actual MPTs.
• Actual MPTs indicated significantly higher maximum expenditure (Omax), price at maximum expenditure (Pmax), and breakpoint, with lower elasticity compared to Hypothetical MPTs.
• Self-reported anticipated consumption strongly predicted the amount of cannabis smoked (R²=0.66, P<0.001).

結論:

• High correspondence between Hypothetical and Actual MPT performance supports the validity of hypothetical MPTs for measuring cannabis demand.
• The strong link between anticipated and actual consumption validates self-report as a predictor of subsequent cannabis self-administration.
• Hypothetical MPTs show promise as broadly valid measures of cannabis demand and reinforcing value.