I did a few times with my husband. I certianly felt it working, almost felt like a different high than nasal insufflation. In my oppinion, I would only do this if you have a few to spare.
Yes you can smoke anything. Is it a good idea at all? Fuck no! Smoking pills is stupid, hard on the lungs and a fucking waste of perfectly good drugs. Don't smoke pills! Eat, snort, plug or if you absolutely must IV them but don't smoke them.