Still sounds like Nas isn't the wordsmith he thinks he is, even if you lend credence to him adopting Thompson's explanation. Seems like Nas was going for the effect of permanently derailing J, reducing him to a pathetic, crippled mess. Yet Thompson's words convey the temporary insanity of the addict who's deep within the valley of his hit (comparable to "beer muscles" but on a psychological plane that's maniacally deeper).
Nas' use of "ether" is in the form of involuntary slaughter... something you avoid if you're not about that life, whereas Thompson speaks of the user who, while a wretch to society when he is on his drugs, is still a man who will eventually "come down" from his cloud, realize his pathos, yet once the crave kicks in, will once again voluntarily seek his way to his valley of wretchedness.
Either way, I'm with @hoodheronova when he says Nas' use of "ether" is shaky at best, but all in all, yes, Nas completely comes off as a monumental smart dumb nikka. The type of dude who seems deep in the first 15 years of your life, but by the time you reach the end of the next 15, you just wannaat all this so called "knowledge" he claims to spit.
That's my over-analysis and I'm sticking to it... Rant over.
Edit: Getting taken to the cleaners in court after marrying a smut who came onto the scene with a song about hating & killing all men (with a shotgun cocking in the background to boot!) kinda also takes a few points off homeboy's intellectual report card as well... He also based the title to the song off of an old wives tale... Smarten up Nas
:belifam:

You sir, deserve a round of applause for the rest of your life, simply off the strength of this post.
at all this so called "knowledge" he claims to spit.
... Rant over.
... He also based the title to the song off of an old wives tale... Smarten up Nas
:belifam: