1. Walt first gave Jesse the ricin to use on Gus. Jesse put it in a cigarette and checked it each time he changed his pack.
(This is ricin Walt made in the super lab. Prior to this ricin, Walt made ricin to give to Tuco that was in meth, then in a burrito, then on the floor, courtesy of Tio Hector.)
1, still. Jesse never used it against Gus. At this time, Gus was trying to get Jesse to agree to kill Walt. Jesse wouldn't, but he also had no use for Walt. Walt was trying to find a way to get to Gus but Gus wouldn't let Walt near him.
1, still. Walt sat by the pool spinning his gun. The gun stopped and pointed to a lilly of the valley plant.
1, still. Saul called Jesse to his office for an important meeting. When he arrived, Huell frisked Jesse. Unknown to Jesse, Huell took the cigarette pack with ricin and substituted a pack without.
1, still. off camera, (this is where it's dicey) Walt got the lilly of the valley into Brock's juice box at school (so said Vince Gilligan.) Brock got sick, went to the hospital, Jesse saw the ricin cigarette wasn't in his pack, assumed he had poisoned Brock by accident, or worse.
1, still. AND 2 - Jesse went to Walt to accuse him of poisoning Brock. Jesse laid out the correct scenario - that Huell swiped the cigs - but Walt denied it. Walt said that only Gus had signed off on killing kids (Andrea's brother) so this moment turned Jesse from Gus to Walt. Walt had poisoned Brock with lilly of the valley, but Jesse didn't know this until later. At that moment, up until Gus dies, Jesse assumed Brock has been poisoned with ricin.
back to 1, still. Jesse obsessed over the cigarette when he learned Brock wasn't poisoned by ricin, so Walt created a fake ricin cigarette and planted it at Jesse's place and helped Jesse find it. That one got flushed. Walt put the real Gus ricin behind the wall socket plate - this is what he retrieves in the flash forward in this season.
3. Jesse didn't want to give up his pot because he has been high on something for most of the series. Saul had Huell take it because "the guy" wouldn't care about Jesse's wants when trying to disappear him.
3, still. While waiting for "the guy," Jesse decides to get high. Can't find the pot. Instead finds a pack of cigarettes. Jesse connects his original assumption about who did the poisoning (which he had already talked about with Walt) to the missing pot. At this point, Jesse is afraid Walt is going to kill him - or, for all he knows, "the guy" is going to literally disappear him.
3, still. But Jesse realizes that Saul, Huell and Walt all conspired against him to kill Gus. The reason he ultimately cares about this is because Brock was used to do this. Jesse has always shown a soft spot for kids - and in Brock's case, this was a kid he cared about, too.
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