As are alcohol and tobacco, far worse drugs in fact. Are you in favour of making those illegal?
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I have yet to hear of a case of a person's driving being impaired because he smoked a cigarette. Nice try though.
I have seen plenty of impaired drivers because they were smoking there cigarettes WHILE driving. They may as well have had a cell phone in their hand. I have seen plenty of cigarette smokers take both hands off the wheel to light their smoke. Or they are busy blowing smoke out their window or tapping off the ash and not paying attention to the road. So cigarette smoking might not be a true impairment, it can be a big distraction while driving.
If you look at the studies, most driving tests with marijuana smokers have found that they compensate for their impairment unlike alcohol. If anything they tend to drive slower and more careful to compensate. Here is a study funded by National Institute on Drug Abuse and what they found:
"During the course study, subjects were asked to respond to various simulated events associated with automobile crash risk — such as avoiding a driver who was entering an intersection illegally, deciding to stop or go through changing traffic lights, responding to the presence of emergency vehicles, avoiding colliding a dog who entered into traffic, and maintaining safe driving during a secondary (in-the-car) auditory distraction. Subjects performed these tests sober, and then shortly (30 minutes) after smoking a single marijuana cigarettes (or placebo)... Participants receiving active marijuana decreased their speed more so than those receiving the placebo cigarette during a distracted section of the drive. [N]o other changes in driving performance were found.”
Thanks for your comment, but unless you have some kind of contradictory study then i'd say that your arguement doesn't hold up to well.