The fundamental purpose of alcohol use is to get stoned or high.
Not true. If you see someone having a glass of wine or a single beer, you don’t think, “She’s getting stoned”. If you see her take one hit off a crack pipe, you know she is.
Nobody takes the equivalent of a “one can of crack”, or a “few sips of heroin”. Most recreational drug users become abusers, while a small percentage of alcohol users become abusers.
At any rate, in a civil society, the people have the right to weigh the costs and benefits of various behaviors and evaluate what behaviors pose too great a risk to innocent people.
There is no fundamental or Constitutional right to smoke pot, smoke crack, shoot heroin, or drink alcohol for that matter.