<quote>

REally? I remember seeing in like volune 6-11 somewhere that there was
this pepper shaker. And there was this thing where Akane sniffed it and
glomped onto Kuno because she saw him right afterwards. I only assumed
that was the passion spice.

</quote>

I donno... the only thing that comes close to that description that I know of
was a geas-inducer, which compels the consumer to do something when a keyword 
is said, sort of like a simple stimulus-response action.
Anyway, from what I remember, Shampoo sneezed and told Ranma to hug her
whenever she gave some other sort of stimulus (like clapping her hands). Two
problems: a) the Geas-spice took the sneeze to be the trigger, and b) the spice
took 'her' to mean the giver of the signal.
Now, Kuno shows up, and he has a cold...
Alright. The point is that there is no reference to an actual 'Passion Spice'
that I know of in the manga. There is no passion involved, just compultion
(like Kunou's own compultion to carve up watermellons into concise sections).

Woah there... That was the magic mushroom episode! She made some nikumen
(or something) from the mushrooms and fed it to Ranma to make him hug
whoever at the keyword... and the keyword was sneazing due to Kunou.

Then Shampoo finds this out and brings along some pepper. She uses the pepper
to sneaze to make Ranma hug her ... but Akane breathes it in and sneazes,
and so Ranma hugs her... That was NOT passion spice!

Unless Ranma got the hots for EVERY guy and girl who sneazed during the
entire story! O_O

Kun-chan...