When I was in high school I kept liquor in my locker. Usually some **** mix of whatever was at home: a coffee mug of a bunch of different stuff.
Pretty much all along for me, but especially when my drinking/using got really serious, I found I could not drink in the morning. First of all, I was too sick from the day/night before, and I'm not talking about 'hair of the dog' sick, I'm talking about hitchhike to the hospital and get a shot of Gravol in the *** so I can stop throwing up sick. Also, I managed (through the grace of something somewhere) to hold a job throughout my active addiction, and I could not drink or use before work because once I started I couldn't stop.
Everyone's pattern is different, and if there's one thing I learned, it's that the best way to tell if you have a problem with something is not by what you read in a book or by what other people tell you, but by the degree to which is wreaks havoc on your own life.