Just like there are people who can handle distilled spirits and those who cannot.
There will be millions who will be destroyed. But there is no way we should use enforced law to rid ourselves of it.
I just read from another source there were 8.6million arrests for pot in the US from 2001 to 2010.
Sure, most of those, by far, were inconsequential or secondary. But it's still too many and the American people are in the process of undoing it.
http://247wallst.com/special-report/2015/12/28/11-states-least-likely-to-legalize-marijuana/?ref=yfp