Bizarre. Never heard that. I suppose it's possible... but I doubt it would happen with isopropylbenzylamine. Molar weight is the same as meth, so I don't see how the vapor would be effected any differently. With MSM or something, I guess it's possible... but I'm no chemist. Kind of an interesting, crackpot sounding theory; but sometimes those are the truest ones, I suppose.Edit: no, I don't think I believe this... the heat differential between the smoke and the ambient room air is what's going to matter the most. Like hot air balloons rising or falling. This has to be bullshit -- the heat of the smoke you breathe out is going to be the determining factor, not the molecular composition. Right chemists?