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Like I said, I think the NYT quote confuses two points - no evidence for increased driver fatalities; and evidence for increased number of accidents. While I can understand how you made the inference you did, as I pointed out, elsewhere in the same NYT article points out that the accident rate is 2x that of other drivers, so there is an internal inconsistency. The simplest correction which makes it match external evidence is assume that the Romano quote omitted the "fatal" accidents context.

The study I linked to says: The data were stratified and analyzed according to study design, type of drug assessment, study time period, study location, or age of the study subjects. A more than 2-fold increased crash risk associated with marijuana use was found in each of the subsets of studies

Table 2 shows the age breakdown as "<25" and "all ages." See http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3276316/table/tb... .




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