Marijuana, although I've heard people say different, slows the human reflexes. My uncle died, as a matter of fact, while under the influence as a direct result.Working around heavy machinery, he crawled into.. I believe it was a riveter, to repair it, but because of his euphoria neglected to remember to turn off the safety switch. The machine was activated by another employee and the machine's actions crushed his neck and head. It was not possible to activate the machine if he had switched it off. They found high levels of THC in his bloodstream during postmortem.
I'm not into the dilution of my mind with drugs; though I refuse to judge somebody because they are. What it comes down to, is responsible use if you decide to ignore the law and experiment. The idea of "responsible use" does not, and should not disappear with the introduction of the word "illegal."
None.