Dude, give me a break. The pot impared driving argument simply does not hold water.
Recent survey data released by the National Survey on Drug Use and Health (NSDUH) indicates 25.8 million people have acknowledged using marijuana in the past year, of which 15.2 million have acknowledged using marijuana in the past month. These figures have remained pretty much the same throughout this decade since the NSDUH improved their survey techniques in 2002 and realized that there were actually about 25% more marijuana users than they had been previously estimating.
These figures, though, only represent the minimum estimates of the number of marijuana users. The Office of National Drug Control Policy (ONDCP) has acknowledged that it is reasonable to inflate such estimates by one-third to account for under-reporting. While they dont like to admit it, they understand that not everybody is forthcoming (that is, honest) when asked by a survey to report on illegal drug use. An ONDCP publication notes that while researchers disagree on the subject of under-reporting on drug use surveys, survey-based estimates of tobacco use, for example, only reveal about 75% of the actual tobacco using population. This brings us to one conclusion, all these pot smokers...drive everyday already! If it was dangerous it would be obvious.