Why mix them, man..Kind of a waste, no?
If you're in the mood for a nice energy-boost, do the coke.
If you're coming back from work, tired as shit, and tryna sit back and chill, do the vics.
Orrr just do the coke and then the vics a little after..I wouldn't do more than 25mg of vics, and that's assuming decent tolerance, low aceta, etc..