Change in delay discounting and substance reward value following a brief alcohol and drug use intervention.

Boudreau et al. (2015) ran a brief college workshop. Students with alcohol or marijuana problems earned vouchers for drug-free fun activities. They also completed surveys on how much they valued drugs versus other rewards.

The team tracked who used six months later. They asked: did the workshop lower drug reward value, and did that drop predict later use?

Yes. After the short session, students rated partying as less valuable. The bigger that drop, the fewer days they drank or got high half a year later.

The link was strongest for heavy marijuana users. Lower drug value, not just better delay tolerance, drove the change.

Davidson et al. (2025) pooled 26 trials of voucher pay-for-abstinence plans. They found dollars beat the economic odds—cocaine users stayed clean more than the cash value predicted. A et al. add a twist: you may not need to pay for each clean test; paying students to sample fun, drug-free life can cut drug value itself.

Garner et al. (2025) flipped the payer. They paid clinic staff $10 for each motivational chat. Staff doubled their talks and clients felt calmer, yet drug days stayed flat. A et al. show the opposite pattern: pay the client, not the counselor, and drug use drops if you target reward value.

Nickerson et al. (2015) looks like a clash. Rat studies showed delay exposure trims impulsive choice but zero effect on alcohol drinking. A et al. saw real drinking fall. The gap is species and measure: rats licked alcohol bottles; students answered surveys. Reward-value shift may need human meaning, not just delay practice.

You can copy the workshop in one class period. Give clients vouchers for club sports, art nights, or hiking clubs—activities available on campus or in your town. Build a menu, let them taste drug-free fun, then track how much they still ‘love’ using. If drug value drops, you have an early sign the habit may loosen over the next six months.