As a motorcyclist I am against anything that impairs the driving abilities of any motorist, for my sake as well as everyone else. The contention that weed doesn't impair as much as alcohol is self serving BS. You're all against drunk drivers and distracted drivers, but some are for yet another government sanctioned form of self anesthesia? I personally won't succumb to any plan on government's part to give me false liberties that make me more dependent or less independent to think and act for myself.
A numb populace is subject to whatever additional bad ideas government can implement. Less regulation, when it compromises safety and independence, is a terrible idea.