So taking smaller hits and holding your hit in wastes less product? All the meth users I've ever known always tried taking the biggest hit to make the biggest exhalation cloud they could..
Whatever you breathe out is wasted, of course, and if you hold your breath long enough, you'll exhale nothing because you'll have absorbed most of the shit. And before someone says it or thinks it, no, crystal meth doesn't recrystallize into dry shards within your lungs. That's not logical. Do you imagine the insides of your lungs are dry or fairly wet? Hint: there's a reason humans can't make it two days without water, you know… And meth.hcl is very hydrophilic.
I snort a little bump and then smoke a bit using a glass pipe and really trying to figure out how to minimize waste.