The suction alone should keep the herbs in the whip.

Just press the whip against the glass condom surounding the heating element, take a nice long draw.. wait 30-45 seconds (stir), and repeat.

Might take a couple days to get used to, but you will get the hang of it. I am not sure if the Cannons are different than the Bros with the temp setting (ie 11 o'clock). Try turning it up to 2o'clock and give that a whirl.

EDIT: Is it not producing vapor at all?