JB, to answer your latest post: We set the bar at very dangerous drugs. Marijuana is not very dangerous. Cocaine, heroin, etc., should not be legal because they are too dangerous and too addictive.
As for whether marijuana can cause traffic accidents -- perhaps. Whether it does or not, it causes far fewer accidents than alcohol does.
There are clearly people in the country who prefer to get their "relaxation" from marijuana instead of alcohol, and given that marijuana is not more harmful than alcohol, they should be able to do that.
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