Regarding smoking pills, yes it can be done, but the best and most effective would be to extract the active chemical from the pills and purify it so you get rid of all the other crap. SWIM done that couple times. Some benzos are more soluble in water than others, specifally with a little citric acid or so to lower the ph, while others are practically insoluble in water and need other procedures.
In any caes, SWIM been lucky enough to have his hands on bags with 50 grams of pure benzos, such as diazepam, alprazolam and flunitrazepam.
SWIM says the most wonderful smoke he ever had was some hits of pure flunitrazepam - better than anything else, coke, pot, opium, meth, heroin, what you can think of, it was the bomb. Extremely addictive though, and it made SWIM smoke rather much and for most of the day.
Pure diazepam is also rather pleasent to smoke according to SWIM.