We did something similar to this in physics in school (catholic schools seem to let kids go a bit crazy with sciences, i think its the fact they have to teach them science and dislike not having god to fall back on) and it was pretty simple. 2 litre drinks bottle with the valve from a bicycle inner tube epoxy'd into it so the screw on bit poked through the lid, for a test we used whiskey, i don't even know where from and put... a bit, in the bottle.
Lid on, attach it to a pump and pump it up till it gets to a certain PSI, i cant recall which one I'm sure the internet would know. Then you unscrew the lid as quick as you can and the depressurisation(sp?) vaporises the alcohol into the kinda stuff you see come our of fog machines, kinda fun, probably a very efficient way of getting drunk and an even better way to screw up your lungs. Can't say i'd advise it harm reduction wise but then again who am i to judge other peoples vices.
For what its worth a bottle full of whiskey vapour did leave you pretty drunk for a few hours, which looking back can't be healthy from such a small amount.
