I would agree that using Naptha for LSA extraction is probably a bad idea, if it's true that it can affect the LSA (destroy some of it or whatever) - and that seems to be true, because when I have used Naptha it hasn't worked.
HOWEVER, I disagree with that MGS said about naptha leaving a residue. I've used Ronsonol naptha for cleaning the waxes/tannins out of salvia extract MANY times with excellent success. It leaves absolutely no residue - I've even evaporated a large pool of it by itself and it leaves nothing to speak of. No oil taste, no visible residue, nothing. I've also used it for extracting DMT from mimosa hostilis, and it worked GREAT for that, providing excellent yields, and again leaving no residue.
So I just wanted to make the point that I don't think people should be so quick to throw out the possibility of using naptha for ANYTHING - it can be quite useful for several types of extractions, especially extracting DMT and cleaning waxes/tannins out of salvia.
Of course for the topic of this post, LSA extraction, I do agree that using naptha probably isn't a great idea.
Just my $.02