I'm pretty sure that, at some point, somebody used either and proceeded to drive into a tree (or another car) while under the influence. Circumstantial evidence

I'm pretty sure that, at some point, somebody used either and proceeded to drive into a tree (or another car) while under the influence. Circumstantial evidence exists, e.g. http://wiki.answers.com/Q/How_does_LSD_effect_your_driving http://wiki.answers.com/Q/How_does_LSD_effect_your_driving or http://www.google.nl/search?q=pot+driving+site%3Areddit.com http://www.google.nl/search?q=pot+driving+site%3Areddit.com. That said, the chemicals themselves are unlikely to cause death. This, obviously, is not the same as "will definitely not have any unpleasant consequence".