SlideShare a Scribd company logo
Cannabis revenues as
temptation goods
Rob MacCoun
Stanford Law School
Jon’s talk: Some key points
 National legalization, probably on the alcohol
model, is very likely
 Long-run consumption may (at least) double
 Prices matter
 Quantity consumed matters more than how many
consume
 Lots of policy levers – are we using them to learn
what works?
5/18/2016MacCoun 2
Nat’l legalization
inevitable?
 Still 46 states to go (45.5 since DC halfway there)
 President Cruz might put a stop to it. So might
President Ryan. Even President Clinton. Or
Republican-led House and Senate.
 CO and WA and OR and AK could “blow it”
 If consumption or harms start “spiraling out of control”
 Headline: “Carload of Utah high school football players in
fatal crash after drug holiday”
5/18/2016MacCoun 3
5/18/2016MacCoun 4
True, but boomer’s support
dropped a lot in 1980-1990
5/18/2016MacCoun 5
Easing budget pressures could
reduce push for pot revenues
5/18/2016MacCoun 6
Effects in CO, WA?
Caveat emptor
 If you want to dismiss opponents’ claims, ought to
hold yourself to same standard of evidence
 May take many years to assess effects
 Retailers have many steps to get licensed
 Legal production has to reach scale
 Short term “nostalgia” and curiosity purchases
 Prices may fall over time (perhaps a lot)
 Dutch marijuana use told different stories in 1979
vs. 1992 vs. 2008
5/18/2016MacCoun 7
On doubling
 With respect to prevalence, we know what a
doubling looks like: 1979
 My students are usually stunned to learn this.
 With respect to consumption, would be entirely new
territory
 My students already have seen a lot more daily and heavy
use than my cohort saw.
 Jon suggests we might see 40 billion additional hours of
intoxication
5/18/2016MacCoun 8
Fundamental tradeoff
 Legalization reduces average
harm per dose (medical, crime,
etc.)
 Legalization increases
number of doses consumed
 Net effect (harm/dose x doses)
is unknown
5/18/2016MacCoun 9
Legalization and
average harm
 In Drug War Heresies, Reuter and I predicted that
after legalization, the average user would be a less
risky user.
 Influx of users who wouldn’t use because it was illegal.
 No longer sure we were right.
 We were focused on prevalence (who uses)
 Might be swamped by increasing riskiness of existing users
and new products (vaping, dabs, edibles)
5/18/2016MacCoun 10
5/18/2016MacCoun 11
What strains with the
High Times Cannabis Cup?
Cannabis Cup
5/18/2016MacCoun 12
 All finalists exceed federal potency estimates
 Trend toward higher THC
 1st place winners have higher THC and lower CBD
SimSemilla model
Users (count)
• Occasional
• Monthly
• Weekly
• Daily
Grams/day
(per type)
Days-used
distribution
Grams/year
distribution
Harm incidents
per year:
• Overall
• by User type
• Gini & skew
Grams/day
distribution
p(harm|dose)
Dose-harm
function:
• Ceiling
• Shape
• Threshold
5/18/2016MacCoun 13
5/18/2016MacCoun 14

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Cannabis Science & Policy Summit - Day 1 - MacCoun

  • 1. Cannabis revenues as temptation goods Rob MacCoun Stanford Law School
  • 2. Jon’s talk: Some key points  National legalization, probably on the alcohol model, is very likely  Long-run consumption may (at least) double  Prices matter  Quantity consumed matters more than how many consume  Lots of policy levers – are we using them to learn what works? 5/18/2016MacCoun 2
  • 3. Nat’l legalization inevitable?  Still 46 states to go (45.5 since DC halfway there)  President Cruz might put a stop to it. So might President Ryan. Even President Clinton. Or Republican-led House and Senate.  CO and WA and OR and AK could “blow it”  If consumption or harms start “spiraling out of control”  Headline: “Carload of Utah high school football players in fatal crash after drug holiday” 5/18/2016MacCoun 3
  • 5. True, but boomer’s support dropped a lot in 1980-1990 5/18/2016MacCoun 5
  • 6. Easing budget pressures could reduce push for pot revenues 5/18/2016MacCoun 6
  • 7. Effects in CO, WA? Caveat emptor  If you want to dismiss opponents’ claims, ought to hold yourself to same standard of evidence  May take many years to assess effects  Retailers have many steps to get licensed  Legal production has to reach scale  Short term “nostalgia” and curiosity purchases  Prices may fall over time (perhaps a lot)  Dutch marijuana use told different stories in 1979 vs. 1992 vs. 2008 5/18/2016MacCoun 7
  • 8. On doubling  With respect to prevalence, we know what a doubling looks like: 1979  My students are usually stunned to learn this.  With respect to consumption, would be entirely new territory  My students already have seen a lot more daily and heavy use than my cohort saw.  Jon suggests we might see 40 billion additional hours of intoxication 5/18/2016MacCoun 8
  • 9. Fundamental tradeoff  Legalization reduces average harm per dose (medical, crime, etc.)  Legalization increases number of doses consumed  Net effect (harm/dose x doses) is unknown 5/18/2016MacCoun 9
  • 10. Legalization and average harm  In Drug War Heresies, Reuter and I predicted that after legalization, the average user would be a less risky user.  Influx of users who wouldn’t use because it was illegal.  No longer sure we were right.  We were focused on prevalence (who uses)  Might be swamped by increasing riskiness of existing users and new products (vaping, dabs, edibles) 5/18/2016MacCoun 10
  • 11. 5/18/2016MacCoun 11 What strains with the High Times Cannabis Cup?
  • 12. Cannabis Cup 5/18/2016MacCoun 12  All finalists exceed federal potency estimates  Trend toward higher THC  1st place winners have higher THC and lower CBD
  • 13. SimSemilla model Users (count) • Occasional • Monthly • Weekly • Daily Grams/day (per type) Days-used distribution Grams/year distribution Harm incidents per year: • Overall • by User type • Gini & skew Grams/day distribution p(harm|dose) Dose-harm function: • Ceiling • Shape • Threshold 5/18/2016MacCoun 13