yeah. a bit suspicious. that's < 5% of the US population. highly dubious.
I'm not sure I know a single "daily drinker". Even the people who had reputations as being heavy drinkers I don't think drank every day. Drinking daily sounds like something someone in recovery would talk about as the final stage of their spiral towards rock bottom before they went to rehab, not something I'd expect 1 in 20 people to be doing.
But maybe I'm underestimating how many people have one glass of wine with dinner or one beer after work.
Thus, it may seem like a significant proportion of the population from the perspective of someone who does, or hangs around at least 1 such person.