On the pro side, it’s been pretty much established that driving stoned isn’t nearly as dangerous as driving drunk. Since 7% of California motorists are cruising the state’s freeways with cannabis in their systems, that provides some comfort. (Sorry, no word on what percentage of the stoners are drunk as well.) Pot also has proven medical benefits; for example, parents of epileptic children are flocking to Colorado.

But the legalize hemp crowd’s timeless rant that pot is harmless is taking some hits.

A recent study claims to have documented the first two known cases of pot-related fatalities. Other studies find that beginning to smoke weed as a teenager — the most common age to start — can affect brain development, causing memory loss, permanently impaired judgment and even reduced IQ.

In musings that might surprise those who remember his “Moonbeam” period (but not those who have noticed there’s no squarer square than an old hippie), Gov. Jerry Brown took to Sunday morning TV to worry aloud that emulating Colorado could leave the state defenseless against (a) foreign business competition and (b) terrorism.

“How many people can get stoned and still have a great state or a great nation?” Brown mused. “The world’s pretty dangerous, very competitive. I think we need to stay alert, if not 24 hours a day, more than some of the potheads might be able to put together.”

The governor didn’t say whether his garbled grammar was attributable to pot or the shortcomings of his secondary education.

I’m always interested in policy appeals motivated by fear. Politicians have unleashed an awful lot of threats — a few real but mostly imagined — during the last decade and a half. And they haven’t exactly made us a better, stronger or more economically successful nation. Brown’s thoughts are nowhere close to the depraved paranoia of Dick Cheney; the idea that California will be morally and economically weakened, its security undermined, because a tiny minority of the state’s residents regularly indulge in the evil weed seems about as serious and substantial as a puff of smoke.

Stay alert? What’s going to happen if we don’t, governor? Are Chinese sweatshop workers going to take a fiscal victory dance on the bones of our stoner-sapped competitiveness? Will our collected stonedness open up the one big chance radical Islamists have been waiting for?

Californians won’t have the chance to vote for legalized pot until November 2016 — if they’re not too wasted to remember.