I had never heard of this product before..."a cult favorite of USAF pilots" ...it claims to be bourbon based....a search on SB found some references....more like a Southern Comfort....but it "may" actually use bourbon instead of grain neutral....see:

http://www.jeremiahweedbourbon.com/thebourbon.html

100 proof bourbon liqueur "brewed" in Kentucky......

I assume it must contain bourbon...at least some %.

http://blogs.menupages.com/boston/20...miah_weed.html