I think people are already well aware that drinking alcohol is unhealthy, and I don’t think that anyone, who consumes it despite that, will stop after learning it is a “carcinogen”.
I honestly had no idea there was anything unhealthy about moderate drinking. Every so often we even see dubious headlines about "daily red wine has health benefits". I'm not aware of specific, nor do I particularly believe it's good for you, but I really had no idea that it's unhealthy.
Some people get hammered. I know that's bad. So, yes, I had that idea.
I'm talking about moderate drinking. Like 1 per day or less.
Yes. I didn't know it was unhealthy. Every substance has a harmful dose. Some of them have safe doses. I didn't know that alcohol (apparently) has no safe dose.
Many societies and sub-societies practice daily light consumption of alcohol, although less so with better water quality.
Frequent "popular health" headlines claim that "a daily glass of wine" or "2-3 drinks per week" has some benefits for heart health of whatever[0]. It is perfectly reasonable for people to believe that light consumption of alcohol, like a glass of wine every other day, could actually be good for them.
It is false, but it is not a ridiculous belief. I'd guess that more than half of all Americans believe it.