And we've known for centuries that eating a lotta food makes you fat. There's an entire clinical wing of physical and mental health illnesses dedicated to highlighting the ramifications of being overweight. Alcoholism was similar, but at least justified centuries back in the times where it was still safer to consume than most forms of water.

Maybe some breaking study brings something up, but it's still a long debate after that to determine how and if society should control those activities. Even with alcohol, it's not illegal for a minor to drink, it's illegal for vendors to sell to them.