Lets assume this is an ordinary pop can. I know it doesn't look too good, but we can pretend, can't we?

Step 1.

First we take something sharp and poke a few little holes into the face of the can.

Step 2.

Then we hold our can with both hands, and press with our thumbs down on the spot where we put the holes, hopefully turning out like above.

Step 3.

Now that the can is crushed, we have a place for the bud to sit. Stick it over the holes, light it up, and inhale through the drinking hole.