Vape Unit
Vape Unit is an item introduced in v1.0 of Horizon 'Mons. It is meant to be used on Rotom in order to change its form to a Rotom-Smog.
Crafting
A Vape Unit is crafted by placing Copper Ingot in the 2nd slot, Brewing Stand in the 5th slot, and Copper Block in the 8th slot.
Use
Using the Vape Unit on a Rotom will change it into a Rotom-Smog