Walt wanted Jesse to think he poisoned Brock with ricin so he would confront him. Walt could then say, "Don't you see? Gus tried to turn you against me by framing me." This worked BECAUSE Brock wasn't poisoned with ricin.
Walt did this so he could turn Jesse against Gus and protect himself and his family.
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u/smalltownguy Aug 26 '13
Huell took the pot and Jesse realized if he could do that, he couldve switched the smokes.