People who drive within three hours of smoking marijuana are at nearly twice the risk of being in an accident that leads to serious injury or death, compared with sober drivers, according to a new review of the research.
While driving stoned is clearly risky — and combining marijuana with alcohol is even more dangerous — drunk driving remains a bigger hazard on the road. Driving with a blood alcohol concentration of .08 — the legal limit — nearly triples the risk of crashing; a blood alcohol concentration of .10 almost quintuples it. Although drunk driving deaths have dropped by more than half since 1982, they still represent about one-third of all auto fatalities and kill about 11,000 people annually.