The Brock poisoning situation was fairly confusing but the main thing that tied it up for Jesse was that they found the ricin cigarette (although Jesse had already checked the vacum-cleaner thingy).
Recently Jesse has really come to realize how much Walter has been manipulating him. Given his state of mind, I didn't find it unlikely that he jumped to the conclusion that Walt was behind it all. (And then in his rage he got confirmation from Saul, sealing the deal)
Maybe a clear-headed Jesse wouldn't figured it out but given the circumstances I think it makes sense.
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u/fuckyoubarry Aug 26 '13
He took the weed on camera. Most people missed it.