The thing about Nitrogen is that your body doesn't react with any "bad symptoms" (except for the death part, of course). You just lose consciousness with 3 breaths, and then you die. No toxic residue like that from cyanide, no nasty smells from electrocution, etc. I'm not generally an advocate for capital punishment, except in very special cases...which must be proved unequivocally.
If you get to thinking you’re a person of some influence, try ordering somebody else’s dog around.