Sounds like a blast, the only shotgun I had apart from the key slung over the back was when we used to hold a j with lit end in mouth then blow it back into your friends mouth so he/she inhales, actually it’s more oxygen deprivation than getting high, this is my thought on the cough to get off theory which I for years have done as a way to get the most from the goodness, as it were, turns out that the best way to smoke allegedly is to just inhale and then exhale, holding it is just minor oxygen deprivation, this comes from the dude who grows the weed up the road I buy, I guess with vaping the process calls for an inhale and immediate exhale, but for me when I hold and slowly release it’s more for the flavor savor, than the high