Saw it months ago. Key words are "high temps".
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I've been 'keeping an ear' to that thread since it started. Mike Petro is a fine guy and knows what he's doing, IMO. He's on to something ... and always admits he is not trying to say
vaping isn't way, way better than smoking. He's just trying to see if it can be safer.
Seems the original study, that kicked off the thread, determined that bad stuff happens to VG at temps exceeding 450 F. The test was done in some kind of chamber not at all like
vaping. Mike's testing (all donated time and quite some expense) has shown that it's easy for coils to hit that temperature even at low volts / watt settings depending on the atty being used. Many of the tootle puffer set ups reach those temps.
The outstanding question that can't be answered from his testing is ... how much bad stuff is being produced just because the coil reached that 'critical' temp. Did the VG also reach it?
Mike has pretty much proven coils can easily reach 450F and beyond even at low 'settings'. He also admits he doesn't know what that means in terms of 'bad stuff' being released into the vapor we're inhaling. He has no way to test/measure that. His approach is if you want to be safe and not be concerned about the reports findings keep you coil at or below 450F.