if you want smokeable passion fruit then dont add any chemicals here is what you do
take the juice then add a mild alkali (baking soda exc) just to get the ph neutral then do a reduction like mentioned before but this time use a double boiler.
once it is down to a thick paste get out a large metal tray and a plastic card and make it into a think sheet on the bottom of the tray then put in the over at 110 to 120 c (just over the boiling temp of water, and come back and check it ever 30 minutes.
once it is no longer sticky but flaky use the same card and try to remove it in as big of shingles as you can from the tray, then ones its off the bottom put it back in for another 10 minutes.
this will result in a substance which actually goes great on desserts (which is exactly how it is intended), but you could just as easily be able to smoalk it, the noted advantage of this is you will get the broad spectrum of scents and flavors, where if you pop a solvent in you will lose out on a great deal of the subtlety the fruit provides.
good luck