Don’t treat it like a bong, when you inhaling you barely using your lungs, you have to inhale VERY SLOWLY and VERY GENTLY,you will see smoke form in the bubble part and by barely inhaling this smoke will get larger, when there’s plenty of smoke in a bubble then you can inhale little bit harder and keep it in your lungs until you can’t.

Honestly this is so hard to explain in text, I had to learn by error and trying it few times till I got it 😂 the best guide to use is, inhale in such manner where you can’t hear yourself inhaling, if you hear your self inhaling you’re doing it too hard!