Knowing how much THC is not possible. Glycerin Tincture were created because alcohol ones taste terrible and burns. Glyverin is used to flavor Hookah Tobbacco so I dont see why you couldnt smoke it. Is is a pre-made tincture or, is it just a bottle of vegitable glycering. If its pre-made, seems like a waste to smoke it, I dont think smoking a tincture will help to medicate. It is made to be taking sub-lingually which means under the tongue.