NP, Walt said it would
look like a heart attack, he said nothing of the pain and drawn out process. It's up to you to find the scene, we're not here for sources...c'mon now, this is pure fan discussion...you want a verified source, find it yourself on Google, which would probably take about five minutes tops (if you can't find it through video, look up scripts if you want it that badly). My memory is good enough, if yours isn't...I feel for you (/pothead). I did some research when it was first mentioned, as I'm sure many others did, and it is indeed the most moronic theory that there is. I'll bet my pair of balls that Walt does not use ricin on himself. It makes absolutely no sense in any scenario you can think of. It's idiotic, to be blunt. It's for someone else, the only question is 'who?'
The fact that Walt doesn't explain it within the show means jack shit; he's a lying, manipulative, conniving mastermind. Nothing that comes out of his mouth is believable. It's not fitting at all; in fact, it's the exact opposite. Walt quite literally has a death warrant already, he's done and finished in every way imaginable. There's nothing that cures cancer, even in this show. Why the fuck would he put himself through a torturous death when he's already guaranteed one? Stupid, stupid,
stupid theory. It's not going to happen. Even if he was 'pushed' to the point to where that's literally all he had left, I can't see a single scenario where that would be better than any alternative unless the alternative is being raped by Hule for a full week and then slowly chopped up with a rusty butter knife.
I personally think the ricin can't be for anyone but Jesse now that we know that Hank and Gomey are dead. The others will suffer a much crueler fate if Walt has his way...which, I don't think will happen. I doubt I'm right, because this show stumps me every fucking time, but anyone else he needs to kill, including Lydia (which doesn't make any sense unless he randomly wants back into the game to make some quick cash) is wide open to any other attack. He clearly no longer has to hide; he's exposed beyond belief when we see him in the year-long time-skip. Completely. The ricin will be for someone who he doesn't want to know that he killed them. The only one that comes to mind is Jesse.
Even so, this show will find a way to factor in another equation entirely. I
cannot wait for the finale!!! Fuck everyone's theories. These writers have our numbers, man. GAME OVER MAN, GAME OVER!
ED: Some of this sounded kinda rude, I don't mean to be, NP. I'm a bit tipsy and become blunt at that point.
Fact of the matter is that I hope each and every one of us is deathly wrong. Thus far the writers have mad sure of that. Those conniving geniuses!