Crack cocaine is one of the most addictive drugs you can get - which is why it fs up so many lives. (in order to 'recreate' that awesome original high, you have to take more and more and more...)
It just isn't comparable at all to softer drugs, like mj or alcohol.
On one hand I believe that people should be able to injest whatever the hell they want into their bodies.. On the other, this stuff is just far too addictive & potent to be of any value to society - legal or not.
most alcohol / marijuana users are casual (ie. they aren't alcoholics or drug addicts). Most crack users get hooked and f up their lives. That is the difference.