The conclusions are based on the study of 83 men, with the ages between 17 and 49 years, who were asked about their driving history and then followed in driving simulators(模拟器). Male participants have been chosen because they more often engage in dangerous driving and driving under the influence of marijuana.

　　According to the results, 35 percent of the 83 participants had been involved in one or more car accidents which resulted in material damage in the previous three years. About 30 percent of them admitted to using marijuana and 80 percent of those acknowledged that they have been driving under the influence of marijuana at least once in the past year. Young men with impulsive(冲动的)character and who enjoy thrills and sharp sensations, are more likely to get behind the wheel while high on marijuana. Men who drove under the influence of marijuana were also more likely to show risky and dangerous driving behaviors tending to get into more crashes.

　　The findings indicate that the use of marijuana, even in low doses, significantly brings up the risk of fatal car crashes. Traces of marijuana are most often found in theurine(尿)or blood of drivers after an accident, which is an indication of risky road behavior and marijuana smoking. It is a serious cause for concern since marijuana is considered to be the 3rd most popular used substance that is being associated with car crashes, after alcohol and tobacco use.

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