What's the rush on this?  

Legalizing doesn't cut out the black market.  They just offer newer/different strains, higher potency or mix it with other drugs.  

It's not good for our health, just check out the increasing body of evidence linking cannabis use with mental illness.

Cannabis legalization results in increased traffic deaths from driving while under the influence.  We don't even have a reliable method to do a roadside test yet!!

Could it be that the government is trading our health/safety for a tax grab?