with a small hose your spit or salivia has a tendency to condense in the hose so the hot air can,t escape fast enough, this used to happen to me also we used to get two different kind of mouth pieces a yellow amber one and a black one the yellow one the end had a tendency to break down from the teeth clamping down on it,the black ones were much better. { i got the mouth pieces from wale apparatus }. just a couple of things that happened to me in the past hope it helps.
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