Cannabis

"And if someone wants to get high, they are free to do so, as long as they don't harm others." Easier said than done, especially if it's not regulated legally: try to guarantee me that a drunk person will always be aware enough not to get behind the wheel. Sure, even illegality can't ensure that, but at least we can be sure that in the worst-case scenario, the one who errs pays [...] Good intentions from a sober person are not enough when it comes to psychoactive substances that alter mental functions.