Just out of curiosity, why no energy drink cans?
my guess is a lot of drug traffickers drink energy drinks to stay awake driving on the late evening/early morning hours. they want to get where they are going as fast as possible, no stops, and want to stay awake.
You could be mixing vodka with it or another type of alcohol.
There is also the possibility that you might be smoking crack, using the can to heat up the crystals.