Clark is too afraid of what's going on - treading on eggshells around Lois (given that he just learned about Red K and he slept with a woman who was only just sexually assaulted) - so he's going to stay quiet about the perfume affecting him. And he sees that Lois isn't being affected, so saying that it was getting to him would only raise questions he doesn't want to answer.
I figured that he'd pass his behavior off as exposure to leakage from the sample he took. Then again, the red K has effects of its own.
At what point do Lois and Clark realize that their investigation into Revenge could lead to a legal defense for Lex?
Read all of the posts yesterday and am thoroughly enjoying it.
