So i was having a conversation with my friend who originally introduced me to hookah, and the topic of smoking came up. He basically mentioned that he would purge the smoke out of the vase/chamber before every single hit he took, claiming that the smoke was "fresher". I have also read this in a few amateur tutorials. Is this really necessary? Ive smoked with and without purging, and have noticed no difference (unless of course the smoke was harsh, and a purge was necessary). To me, doing this seems like a waste of time, and more importantly a waste of smoke. Does any also do this, or completely disagree with the practice?