Not that I plan on trying this but a bong filled with Dimetapp seems like it might taste good, or at least it did on mushrooms. To say the least a grape flavored bong would be tasty. (I'm not a big fan of getting messed up on cough syrup.)
Why would you do that? If you want your weed to be flavoured buy some Tasty Puff. There's like millions of different flavours man.
cough medicine makes your insides explode with gas and you fart uncontollably for like 2 days afterwards.
Yeah that shit tastes horrible putting it in your bong would just make smoking seem like sucking on ass.
Weed does taste amazing but I have always liked the completely fake grape flavor and thought that flavor might go well with bud. I have never tried this and don't intend to, it was simply a thought I had while I was on something, if I remember correctly it was magic mushrooms but there is a chance that it was just a bunch of weed.