Table 3.
Differences-in-Differences Estimates of the Effect of Medical Marijuana Laws on Potency (THC%), 1990-2010
| Variables | (1) | (2) | (3) | (4) | (5) |
|---|---|---|---|---|---|
| Medical Marijuana Law | 3.48 (0.59)*** | 1.49 (0.66)** | 0.55 (0.56) | 0.54 (0.56) | 0.53 (0.55) |
| Decriminalization Policy | 2.61 (0.95)*** | 2.62 (1.05)** | |||
| Log Outdoor Plots Seized per 100,000 Population (Lagged 1 Year) | 0.01 (0.16) | ||||
| Log Indoor Grows Seized per 100,000 Population (Lagged 1 Year) | -0.27 (0.15)* | ||||
| Seizure-to-Analysis Lag (Months) | -0.14 (0.01)*** | -0.11 (0.01)*** | -0.11 (0.01)*** | -0.11 (0.01)*** | |
| % Male | 0.56 (0.30)* | -0.31 (0.72) | -0.31 (0.71) | -0.39 (0.74) | |
| %Non-Hispanic White | 0.03 (0.01)* | 0.01 (0.10) | 0.02 (0.10) | 0.01 (0.09) | |
| % Aged 20-29 | -0.24 (0.15) | -0.24 (0.13)* | -0.22 (0.13)* | -0.22 (0.13)* | |
| % Aged 30-59 | -0.28 (0.16)* | -0.12 (0.26) | -0.05 (0.25) | -0.06 (0.24) | |
| % Aged 60+ | 0.06 (0.11) | 0.08 (0.28) | 0.11 (0.27) | 0.05 (0.27) | |
| Log per Capita Income (Thousands) | 8.20 (1.06)*** | 3.40 (2.40) | 3.48 (2.28) | 3.23 (2.33) | |
| Log Population (Hundred Thousands) | -0.33 (0.19)* | -4.49 (3.96) | -4.57 (4.00) | -4.76 (4.03) | |
| Constant | 5.60 (0.51)*** | -34.70 (18.88)* | 36.03 (49.86) | 31.28 (48.39) | 38.63 (52.14) |
| State Fixed-Effects | No | No | Yes | Yes | Yes |
| Year Fixed-Effects | No | No | Yes | Yes | Yes |
| R2adj | 8.7% | 29.1% | 33.8% | 33.8% | 33.9% |
Note: Cluster robust standard errors are reported in parentheses. N = 39,157.
Significance levels:
*
10%,
**
5%,
***
1%