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Quantifying cannabis: A field study of marijuana quantity estimation.

Mark A Prince1, Bradley T Conner1, Matthew R Pearson2

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Psychology of Addictive Behaviors : Journal of the Society of Psychologists in Addictive Behaviors
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Marijuana users often overestimate the quantity of cannabis they prepare for a single dose. This inaccuracy in self-reported marijuana quantity poses challenges for research on its health outcomes.

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Area of Science:

  • Addiction research
  • Cannabis science
  • Substance use epidemiology

Background:

  • Accurate assessment of marijuana use quantity is crucial for understanding its health effects.
  • Current methods for quantifying marijuana consumption face significant challenges.
  • Limited research exists on the accuracy of self-reported marijuana quantities.

Purpose of the Study:

  • To evaluate the accuracy of marijuana users' estimations of prepared quantities.
  • To identify predictors of the amount of marijuana prepared for a single dose.
  • To determine factors influencing the accuracy of marijuana quantity estimations.

Main Methods:

  • A field study involving 128 regular-to-heavy marijuana users.
  • Participants prepared and estimated quantities of marijuana flower (joint, bowl) and concentrate (dab tool).
  • Analysis of self-reported quantities versus actual prepared amounts.

Main Results:

  • The majority of participants significantly overestimated the quantity of marijuana used.
  • No robust predictors for estimation accuracy were identified in this sample.
  • Self-reported quantity estimates demonstrated considerable inaccuracy.

Conclusions:

  • Self-reported marijuana quantity assessments are unreliable.
  • Inaccurate quantity estimations complicate research linking marijuana use to outcomes.
  • Further research is needed to develop reliable methods for quantifying marijuana consumption.