Really now, no one has ever been injured or killed because of something they did while they were high? And this is despite the fact that it's proven detrimental to a multitude of brain functions, especially motor skills and perceptions of pain. Site your source.

"The areas of the brain where cannabinoid receptors are most prevalently located are consistent with the behavioral effects produced by cannabinoids. Brain regions in which cannabinoid receptors are very abundant are the basal ganglia, associated with movement control; the cerebellum, associated with body movement coordination; the hippocampus, associated with learning, memory, and stress control; the cerebral cortex, associated with higher cognitive functions; and the nucleus accumbens, regarded as the reward center of the brain. Other regions where cannabinoid receptors are moderately concentrated are the hypothalamus, mediating body housekeeping functions; the amygdala, associated with emotional responses and fears; the spinal cord, associated with peripheral sensations like pain; the brain stem, associated with sleep, arousal, and motor control; and the nucleus of the solitary tract, associated with visceral sensations like nausea and vomiting.[6] Most notably, the two areas of motor control and memory are where the effects of cannabis are directly and irrefutably evident." (Health issues and effects of cannabis - Wikipedia, the free encyclopedia)


And thank you for repeating what I said about alcohol being dangerous, as well. I mean, obviously I was saying that it being legal means it's safe. No, the point is that marijuana is dangerous, regardless of whatever facts you think you're regurgitating. It fucks with the brain, and people do develop dependencies on it, despite the fact that a pothead will deny it far longer than an alcoholic.
By the way, the lethal BAC is considered to be 0.50%. 0.40% is at the low end of the death risk range.