When I (at a young age) started smoking a few years ago with my friends we would take what we called a lung, or a rocket, (a 2 Litre bottle cut in half with a pipe bowl melted into the lid, and a plastic bag taped to the bottom half of the bottle to form a lung sort of thing. Hence, lung) whenever I would take a lung full of smoke I’d cough and cough for minutes with intense pain in my chest and the intense high kicking in. It was all so overwhelming and if I couldn’t get a drink or something to ease the pain I’d throw up. I used to do it all the damn time. Would still spark up again straight after though of course. With joints I’ve always been fine and by the time me and my friends got our hands on a bong I was past the stage of throwing up. Although sometimes after a bong I would still be incapacitated for a couple minutes catching my breath and wondering why tf I just did what I did. The fact that you’ve never greened out amazes me.