The second time Walt created ricin, it was intended to kill Gustavo Fring. He created a small vial of it in Gus' own superlab, supposedly out of sight, and secretly passed it to Jesse, who concealed it in one of his cigarettes.
With this in mind, Jesse starts to feel bad being with Andrea, and decides to end the relationship and stop seeing her and Brock ("Hazard Pay"). Jesse later finds out that Saul had Huell steal the ricin cigarette from his pocket, and that Walt was indeed responsible for Brock's poisoning.
Walt then takes the cigarette to Jesse's house to help him get a peace of mind about it all and plants it in Jesse's Roomba to convince him that everything is a-ok in S05E02: Madrigal.
Jessie thought its his idea to kill Gus where as actually it was Walter's idea to begin with. Later, after removing Gus, with the help of Jessie, Walter creates a fake copy of the ricin cigarette (without poison) and destroys it along with Jessie, while keeping the original cigarette for his later use.
This also still provides Walt with way too much deniability when Jesse confronts him: Yes, I took the ricin back from you, but I didn't do anything to Brock, and you certainly can't prove that I did.
Later on, Walt himself admitted to Jesse that he poisoned Brock with a Lily of the Valley plant just to keep Jesse on his side in order for them to orchestrate the death of Gus Fring, but by that point, their relationship was already in shambles.
Then, Walt has Saul, through his bodyguard Huell, remove Jesse's ricin cigarette by switching out the packs. He removes Jesse's pack with the cigarette containing the ricin vial and puts in a pack without it. This happens when Huell gives Jesse a pat down after Saul calls him to the office.
And so the writers' room is softening Jesse as it hardens Walt. The duo's search for the ricin cigarette is Exhibit A. Walt is playing Jesse: We see him make a fake cigarette out of salt. He plants it so Jesse can find it and reassure himself that he didn't accidentally poison Brock.
Ricin is a poison that Walter White prepares twice. Even though it is not the fastest-acting method of killing, Walt prefers it because it leaves behind little or no trace of its use on a victim.
Death usually occurs 36-48 hours after exposure, but if a victim survives a few days, he has a good chance of recovering (though he will almost certainly have permanent organ damage).
Brock obviously recognized and was scared of him when he went to Andrea's house in the last season, but based on his actual reaction to Walt, I don't think Brock knew for certain that Walt had been the one who poisoned him. Otherwise he would have reacted much more violently to Walt's presence in his home.
Saul definitely knows that Walt poisoned Brock. In 501 "Live Free Or Die," Saul tries to end his business relationship with Walt, noting that he didn't know the kid (Brock) was gonna end up in the hospital.
Off camera, Walt crushes up some of the poison from the Lily of the Valley plant and injects it into a juice box. Also off camera, Walt delivers the juice box to Brock's school. (Having seen Brock the day before at Jesse and Andrea's place.)
In the season 5 episode Confessions Jesse realises that Saul and Huell took his ricin cigerette on the orders of Walt (Jesse finds this out by threatening them with a gun) which causes him to also realise that Walter was behind the whole false story of Gus poisoning Brock when it had been him all along.
No. From the moment Walt had him dragged out from under that car in the desert, Jesse never forgave his former partner. From that moment on, Jesse felt nothing but hatred and resentment towards him.
But he also knew that the risk of Brock dying was real, especially if he was not diagnosed in time. Moreover, it is Jesse who immediately directs the doctors towards a poisoning. Perhaps without this, the diagnosis would have been too late.
Acquired Poison Immunity: Beforehand, Gus took an antidote and later activated his gag reflex to avoid the effects of the poisoned drink.
Wilmington is a fictional brand of cigarette featured in Breaking Bad. Jesse Pinkman primarily smokes Wilmingtons, and the cigarettes play a key part in Season 4.
It's revealed in Season 5 that Ted ended up hospitalized with severe neck trauma. He has to keep his head in a huge protective brace and his head was completely shaved.
After that was all tied up, he went to see Brock. Turns out, Andrea's mom had recently died of a heart attack, so Jesse formally adopted Brock. The duo now lives in Phoenix, where Jesse has his own carpentry business. He spends his days making perfect boxes and so much more.
Jesse was actively putting Walt and his family in danger by pouring all the gasoline in their house. And when Walt found out Jesse was working with Hank he felt betrayed and so he spit on him and told him he watched Jane die to make Jesse feel betrayed.
Many thoughts of grief may have flooded Walt's mind after Hank was killed in Breaking Bad, but the reason why Walt tells Jesse the truth about Jane's death is indicative of his true nature. Walt's evolution to becoming Heisenberg was created out of a series of events of desperation and tragedy.
In this fictional universe, the answer is no. Walt is/was highly inteligent and meticulous. In planning the death of Lydia, he would remove any chance of it having any other possiblilty than what he choose for her. Looking for proof? The writers wrote Walter a P2P formula that does not exist.
After Lydia leaves, Walt removes his hat from the table, revealing a hidden vial of ricin presumably meant to poison her. Walt then hides the vial in his house.
Walter used Lily of the Valley instead of ricin because it has similar attributes to ricin without actually BEING ricin. If it was actually ricin in Brock's system chances are Jesse would have been taken by the FBI.