So how stoned would someone get on one ounce? Would you get arrested for smoking one ounce of the new marijuana, but with the old-time stuff you could smoke two ounces?
It was never possible to smoke an ounce of marijuana worthy of the name (as opposed to ripoff ditchweed) in a single session; an ounce has always been good for several dozen joints, the more typical unit of consumption. And if the weed is more potent, one will smoke less to get the desired effect - just as a beer drinker who switches to liquor lowers his volume consumption.
What a mess, so many ways this can be done wrong.
Hard to do worse than the War on Marijuana, which only hyperinflated marijuana profits and channeled those profits into criminal hands. Our alcohol regulations may not be perfect, but they beat the Hell out of Prohibition.
You describe normal users and drinkers. Trouble is, many are addicted to alcohol and other drugs and would not lower volume of consumption. I have no problem with people using any of this stuff...I do have a problem with people getting hooked, which too often ends costing taxpayers a bundle in medical care.