Possible to a degree but not recommended. The freebase crack cocaine will vaporize partially in a glass bowl with a flame underneath, but the crack rock will not vaporize completely or very cleanly. Invest in a fairly thick metal pipe fitting three to four inches long from any hardware store as your pipe and some Chore Boy copper mesh from either a dollar store, grocery store, or ghetto convenience store for use as a filter, with a white plastic Bic pen for pushing the mesh inside the pipe fitting properly. A "rose" glass stem is less desirable, as the glass invariably cracks after heating for just a little while too long. The metal pipe fitting, on the other hand, is good and reusable for life. The heavier the metal pipe fitting is, the longer you can torch on it before it gets too hot to handle.