Well... the dangers to your health from smoking this weed will be caused only by the presence of the solvent you did use to extract the oil in the weed.
I use acetone to extract the THC, and i wouldnt like to smoke weed with acetone in it... i think only butane would be safe enough, as probably it would evaporate completly during the extraction process, leaving the weed un-'contamined'.
"Everything we do, everything we are, rests on our personal power. If we have enough of it, one word uttered to us might be sufficient to change the course of our lives. But if we don't have enough personal power, the most magnificent piece of wisdom can be revealed to us and that revelation won't make a damn bit of difference." Don Juan Matus - Tales of Power