Ethanol is not used very often for making extracts.

Acetone is the currently preferred solvent because it is currently the best!

But there should be no acetone as it is allowed to evaporated away leaving only the plant compounds and especially the Salvinorum-A. Sometimes other methods are even used to draw out the tanin and other plant compounds that make the smoke harsh.

So unless your buying a shady deal, you shouldn't be tasting any ethanol.

You don't have to use a torch lighter, but it's a good idea, because you have to get it really hot to vaporize Salvinorum-A into the smoke and get the psychoactive effects.