first you would have to puriy the coffee/do a caffeine extraction
or originally coffee is black. but when you purify it, it becomes white.
i wouldnt recommend smoking it or eating to much because pure caffiene IS toxic. and CAN kill you.
none the less, i would say hold the smoke in. but thats just a guess. you can try it and if you dont feel anything, try swallowing it.
good luck. and here are some links for info:
http://www.saskschools.ca/~greenall/...extraction.htm (caffeine extraction)
http://www.seriaz.org/downloads/4-caffiene.pdf (caffeine extraction 2)
http://www.instructables.com/id/Extr...m-Caffeine-Pi/ (extracting caffeine from coffee pills. this includes the warning that it is toxic in high doses)
http://en.wikipedia.org/wiki/Caffeine (caffeine information)
hope that helps