The occasional recreational use of large amounts of intoxicants in order to engage in escapism from troublesome or unpleasant aspects of your life. Particularly appropriate for a person who perhaps is technically considered to be abusing the drug, but is otherwise functional the rest of the time.
I'm not a pothead. I smoke like four times a year. Yes, I smoke half an ounce each time, but it's not like I can fly off to Cancun for the cost of half an ounce. It's my intoxivacation.