"What else" implies there is something already, but you haven't made a list of the things you already know you can vape... Off the top of my head: Nicotine E-Juice Any dry herb*, including marijuana Any glycerine tincture*, including marijuana concentrates/waxes oils* * I don't recommend vaping random herbs, random tinctures, or any oils; inhaling some otherwise edible things may be harmful. Inhaling oil is harmful, from what I've read.
NGCMBL!!!!!! Look around. Try belly button lint. Maybe a piece of dry dog food. Let us know how it goes!
Aside from these ignorant responses there are other herbs you can vaporizer. As far as what they are I'm not sure, but I do believe a similar topic was discussed here before. If you can't find it try googling it my friend.
I'm sure I've read before that things such as mint, lavender and even rosemary can be vaped. Never really cared enough to delve into it any further than that though. I suppose it could be nice to add a little to your MJ for flavour. But I just really love the flavour of MJ as it is when vaping. Much more flavoursome than combusting.
It has to be used car oil mixed with the grease from your driveway. What a rush. Lol i'm kidding. Don't smoke used car oil mixed with grease from your driveway. The toxins you inhale will either send you to the hospital or kill you.