Smallville

I just started watching smallville as a background show well I wrote university dissertation and now have reached season 4… all I have to say is what the actual hell is happening? First two seasons had small plot of the radiation and people getting super powers well “clark Kent faces a regular life of high school teenager well learning to control and understand his powers!”.. typical plot for a tv show for tweens. Now I was eating up that whole caves and symbols arc but season 4 rolls around we get more fillers and then boom witch hunt. Everyone’s got a piece of kryptonite?, lana is now possessed by a witch? And Clark’s on a hunt for the keys to knowledge. However I have never been more confused in my life!! Now take this with a grain of salt because I don’t have time to open a comic book right now and try to understand it… but I thought clark Kent’s greatest weakness (besides being human) was kryptonite. How is he suddenly getting hurt by witches spells and swords/daggers? I just don’t get it. Not to mention atleast a dozen people in that town have seen him do crazy sht and no one believes them? I get plot armor whatever still focused on the fact he can be injured by the witch possessing lana and the metal from krypton (that one episode we saw a dagger that hasn’t been mentioned since?) however the kryptonian metal does kind of make sense? In its own way. Whatever I’m stuck on the witch part…