I'll give the new version a spin and see if I can see that heat bar, I didn't notice it before but I may just not have been looking in the right place...
Good to know about the food, I will keep my eye out for that sort of gem (I would probably assume from the name that it was cursed :-))
The smoke and fire it was, if I recall correctly, that there were grey-ish effects and red-ish effects and my assumption was that they were smoke and flame respectively, but that looking at them (or maybe walking through them) didn't have the effects I expected... I'll look again in the new version :-)