I know lots of cannabis smokers, and have know many more over the years, and have not seen one with the effects you describe. Perhaps we are practicing correlation instead of causation, hum?
You don't know anything at all about cannabis, do you? If I were given to guesses, I'd guess that you were told inaccurate information by authority figures, just as ignorant themselves, and you believed without researching their sources.
After such conditioning, it's simple to assume that the failure of a man who smokes cannabis is because of the cannabis. The flaw in that pseudo-reasoning, of course, is that, when faced with others that smoke the plant and succeed in life, the pseudo-reasoning collapses making the proponent thereof look mildly foolish.
ROFLMBO! This is rich! I don't know anything about pot? I saw it ruin many people's lives and families. I didn't just take someone's word for it!!! I saw it firsthand, occurring before my eyes!! ::BONK noise:: You guessed WRONG!!
Sorry! I do not know of anyone who smokes it that is successful in life. Maybe those types are only on the coasts....where it is ok to come into work when and if you feel like it. (Tallahasee has the worst work-ethic a mid-westerner has ever seen!!) My apologies for not having successful business people that are pot smokers to see as examples.