Alcohol is a drug. Each substance that makes you dependant on it is a drug. Being dependant on something means that you don´t have control, which implies that you are not free to make your own decissions.
The problem with alcohol is that this drug is socially accepted and it isn´t considered as dangerous as other drugs like cocaine or speed.
By and large, we don´t feel aversion against alcohol. You can say to a friend “my oldest son got drunk yesterday” and surely they are going to understand the situation and forgive him thinking that he is just a naughty boy, but try to tell your friends that your daughter has sniffed cocain. They would probably never allow their kids to go out with yours.
Another huge problem with alcohol, like with other drugs, is that you don´t realize of the situation until you are caught by it. To put it simply: when you want to stop drinking you can´t, and then you would probably need specific help for your adiction.
Youngers are very unconcious and they don´t calibrate the risk of drinking without control. Recently, at the annual party of my children´s school one girl drank so much alcohol -of course the one she brought because it was not allowed at the party- that she felt really sick and her pals had to phone the emergency number because she suffered an ethilic coma. Maybe she didn´t have enough information, maybe she is just stupid…, but in order to prevent this kind of situations I agree with making information campaigns about these tasks.