Thanks, Morgana.

I finally have a few minute free to do a bit of research. This was the scene that made me think that Lex was influenced by the pheromones:
Quote
NIGEL
Sir, is everything all right?

LUTHOR
No. Nigel. Something terrible's
happened. Something catastrophic.

NIGEL
The collapse of the world financial
market?

LUTHOR
No, Nigel. Worse. Far worse.

Luthor stands, walks over to the balcony, looks out at the
city below him.

LUTHOR (Cont'd)
Not like you, or any other average
person perhaps, but in my own
strange, and perverted sort of way,
I've... succumbed. I'm in love.
Hopelessly, eternally. I'm in love
with Lois Lane.

NIGEL
It's the perfume, sir. Your mind
is clouded.

LUTHOR
No, Nigel, I'm _really_ in love.
I'm doomed.

Granted, Lex himself discounts my/Nigel's theory, but in this instance, Lex is even less of a reliable witness than usual. After all, Lois et al. did not seem to realize that they were under the pheromone's influence, either, while it was affecting them.

The timing of his falling in love with Lois just strikes me as a little too coincidental if the pheromones weren't involved.

Joy,
Lynn