They say cannabis is an expectorant. so it's entirely natural to cough. Some even say "You gotta cough to get off!".

It could be the nastiness of the matches. I hate the smell of matches so i've never used them to blaze.

When i take a hit i like to inhale from my diaphragm and fill my lungs from there. a nice deep, therapeutic hit. If you've ever done Yoga or played a wind instrument think about deep breathing.

An 1/8 in 10 days is not that much. Are you sure it's decent weed? no mold or other crap in there? that'd put a hurtin' on you in no time.

I've been smoking for a VERY long time and i still cough my brains out to this day. The only time i ever experience pain or discomfort or wheezing is after i've scooped the cat boxes, swept the basement, sanded drywall, or any other activity that stirs up dust/mold/etc.

I also hate smoking old/burnt weed. I am constantly cleaning my pipes cuz i hate the old tarry resin taste. try keeping your pieces clean.

Cannabis won't pollute your body. it's a wonderful substance that hasn't caused cancer or death or any of that shit. that's all reefer madness propaganda.

that's my experience anyways...

good luck.
skeet