If you are indeed doing everything right, your bong is probably not air tight.

To test it take your empty bong and cover every hole on it with your mouth and hands, then blow

If you cant exhale into the bong, its airtight, if you can, its garbage and time for a new bong, or rubber grommet seals
420purplehaze420 Reviewed by 420purplehaze420 on . My First Bong Hey guys, just got my first bong today (I've only taken one hit from it so far, never any bong hits before), and I'm wondering if I'm doing something wrong. I light the weed, and I inhale to fill the chamber with smoke, with my thumb over the hole. Now even though I have my thumb on the hole, I'm getting a lot of smoke in my mouth and some in my lungs, and the chamber isn't filling up very well. Can someone give a newbie some advice on how to fill that sucker? Rating: 5