seems that the color of the pills would affect the effectiveness of
some drugs. would be curious to know how the color of
VG affect the experience..

here a link
abstract

Interesting question. What about the color of the spice?

Complete article attached.

i think colour of dmt will influence the trip primarly couse it contains different alkaloid's spectrum,but maybe it could be influenced by colour itself too.. i think colour of smoking defice,expecially if bright as the VG colours will influence the trip much more

I thought about this. And how flame is the last thing I see. Light. Heat. Could have any number of unknown effects, even if it isn't obvious.