Yeah, pure parafin smells, so if it doesn't smell it's because they've put something in it. I read in Michal Kahn's 'Poi Spinning' book that generally if fuels seem nicer they're a lot nastier. Pure parafin isn't too harmfull but it stinks, whereas the odourless stuff smells less but has seriously nasty additives. You only have to hold a couple of shots of alcohol in your mouth for a while to feel how much you absorb liquids in your mouth, so I'd definately make sure you know exactly what's in it.
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Will those capable of telekinesis please raise my hand?