"• Mexican DTOs’ gross revenues from moving marijuana across the border into the United States and selling it to wholesalers is likely less than $2 billion, and our preferred estimate is closer to $1.5 billion. This figure does not include revenue from DTO production and distribution in the United States, which is extremely difficult to estimate with existing data.
"• The ubiquitous claim that 60 percent of Mexican DTO export revenues come from U.S. marijuana consumption (Fainaru and Booth, 2009; Yes on 19, undated) should not be taken seriously. No publicly available source verifies or explains this figure and subsequent analyses revealed great uncertainty about the estimate (GAO, 2007). Our analysis— though preliminary on this point—suggests that 15–26 percent is a more credible range of the share of drug export revenues attributable to marijuana."

Economics

"Economic analysis can be an important tool for policy evaluation, although the limited information available on drug-related public expenditure in Europe represents a major obstacle and makes comparison between countries difficult. For the 16 countries that have produced estimates since 2002, drug-related public expenditure ranges from 0.01% to 0.5% of their gross domestic product (GDP). From the information available, it appears that the largest share of drug-related public expenditure is allocated to drug supply reduction activities (Figure 4.4).
"Public expenditure on supply reduction includes, among other things, expenditure on drug-law offenders in prisons. The EMCDDA calculated a range of estimates, where the low estimate considers only those prisoners who have been sentenced for a drug-law offence and the high estimate also includes pre-trial prisoners who may be sentenced for a drug-law offence. Applying these criteria, European countries spent an estimated 0.03% of GDP, or EUR 3.7 billion, on drug-law offenders in prison in 2010. Including pre-trial prisoners, the estimate rises to 0.05% of GDP or EUR 5.9 billion."