You keep the pipe in your mouth at all times (they go out after 30 sec - 1 min if you aren't blowing or sucking in), and if you either suck in smoke, exhale it and then blow air through the pipe, or just inhale the smoke (in your mouth, not your lungs), and then blow the smoke back into the pipe - either one works fine (you can inhale/exhale quickly too - almost like you're hyperventilating - if you feel a bit bored), but you've got to keep the air going both ways constantly to feed the fire deep in the bowl

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Question, challenge, and always keep a fresh battery in your bullshit detector