I haven't (yet) noticed that smell coming off my Najas, Hemachatus, or Aspidelaps. However, when I kept Dispholidus, they would really stink up the room! Okay, so maybe stink isn't exactly the right word, but the very, very strong smell of licorice (maybe a hint of maple syrup?) filled the room. The smell was always the strongest after a shed. I didn't notice the smell with juveniles, only mature adults. My sample size was pretty low so take these comments with a grain or two of salt, but it's interesting to think about at any rate.
The only common denominator I've noticed with my Najas is their feces - yeah it's kind of gross, but they all have a very particular smell to their feces. All my snakes eat f/t rats and mice, and the cobra crap smells different from any of my other snakes. When they go, I automatically know it wasn't a python or boa.
-----
Chance Duncan
www.rivervalleyexotics.com