I do not drink alcohol or smoke.
When you hire me:
I choose not to drink, in fact I rarely have a chance even when I’m not entertaining at an event like yours. Would you offer a beer to a wedding celebrant in the middle of the ceremony when they’re working? Would you be OK if a surgeon joined you for a quick whiskey while you were lying the table? Even the bar staff at your venue at your venue don’t partake while they’re working.
I won’t be drinking, I don’t smoke, I won’t even stop for a meal. I focus my attention on your event.
Alternative:
It may be hard to believe, but some entertainers expect meals and alcohol to be supplied as the night proceeds. Some even suggest they work better after a few beers. Just like a surgeon or professional driver, right? If it’s OK for your DJ to have a few, who then is responsible for deciding when to say when? Who is responsible for their trip home?