At least, not as wide. I frequently see 'balloon tire' 1.9" - 2.2" slicks on MTBs and beach cruisers. I rarely see a slick on a hybrid and if so it's generally 35mm or less. This is probably because a hybrid could install a 25mm road tire, so what's the point of a fat slick if you want to go fast..

I love 700x40 semi-slick Michelin Citys on my hybrid. Fast but durable for the flat gravel trails that I ride. Plenty fast on the road for a hybrid.