Yeah, I've seen a lot of articles saying that GenZ is drinking less overall, and what they're buying is nicer, which is making it harder for the alcopop companies that sell bulk cheap booze.
I think we tax alcohol higher in the States, and it depends on where you live for how difficult it is. Some places you can't get any alcohol at the grocery store, some you can buy beer/wine at the grocery store, but anything harder is at a state-run liquor store, and some places they'll sell you vodka at Walmart. There's more variance, but yeah, depending on where you live alcohol's more difficult to get than cigarettes, since those are at most grocery stores.
Liquor is commonly understood to be 40-50% ABV
None of this is really exact anyway. This is what doctors seem to go on
The problem is the beer I usually drink is in a 24 ounce can, and has 9.8% abv, and I don't know a single person who would call that 4 drinks (which it is! One drink is .6oz of ethanol, and that can of beer has 2.4oz of ethanol)
Doctors try to get people to accurately report their lives because people aren't thinking about this. I remember there was a place (Scotland maybe?) where they put how many "Units" of alcohol were in drinks, which I think is a good idea for these kinds of things. A unit seemed to be that 0.6oz (~17ml) of ethanol you get if you do the math on the earlier measurements.