I had post nasal drip a few years ago, its really no big deal. I had the "gag reflex" kind of deal that you stated as well as a constant sore throat because of the nasal drip agitating my throat. A vape will be your best bet man. I don't think smoking weed in general would worsen your condition, its not bronchitis or anything, but a vape will save your lungs a lot of damage. I have gotten pot related bronchitis numerous times and the only way to stop it is use a vape or quit smoking for a week or 2 and it clears right up good as new :thumbsup: Vapes also give a great body high no matter what the weed and is great to get through the day with a nice high that doesn't effect the mind at all so you can go to work, school, etc...Get the volcano if you can spare 600$ its by far the best. If not look into any vape before buying one because there are a lot of them out there that are lemons and you don't want to spend 200 bucks on something that is a POS like i did. DO NOT buy the Mt. Fugi volcano wannabe...it will break in like two weeks its terrible biggest waste of 200 bucks ever