As a user of both 'soft' and 'hard' substances, I know that my intoxication does not help anyone else, but it certainly doesn't hurt anyone either - no more than any other private recreational activity anyway. After all, what good is someone who plays video games all nght, for example? Are they any more use to society than someone who's high all night? So long as both the gamer and the user work during the day and pay their taxes who cares what they do at night?
You stated above 'it always will eventually lead to' a bunch of unsavoury stuff. Why do you think this? Do you believe that something like cocaine can actually make a person perform an action like a parasitic organism using it's host? I can assure you this is not the case. A hallucinogen like LSD or 2CB can alter your perspective on reality, perhaps making you see and hear things which are not there, but at all times you are aware you are on the drug, and you can control yourself. Just because someone is intoxicated that does not change their morals or absolve them of responsibility. If someone commits a crime on drugs it is entirely the fault of the person. Not the drug.
One joint certainly makes you intoxicated.
