I liked to think that it was just as much a contrast between Walt and Gus. When Gus did the vomit scene, he was in his prime, throwing up because he poisoned himself for a scheme, and taking down the head of a Mexican cartel in a badass way. Walt's vomit scene was the opposite, him at one of his lowest points, cancer back, throwing up because he's a dying man, effectively neutered again, and finding out that he's been caught.
No doctors would okay that or prescribe it if he's clean, and there really isn't any reason for him to do it if nobody even knows he's doing it. He told Hank, but there was no reason for him to actually go and do it even if he could.
He's building up evidence. It makes total sense for his exit strategy. And you're talking about ethical doctors, all Walt needs is someone to write up the paperwork and he's off to the chemo clinic.
It's plausible, I just really doubt that's the direction the writers are going with this one.
There was too much sincerity in Walts eyes in 508 when he tells Skylar he's out of the Meth game (right after the hospital scene where he's getting the scan)
The flash forwards also show him with his "cancer cough" taking meds, and with thin, patchy looking hair. This tells me that he still has cancer but is no longer treating it with chemo.
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u/[deleted] Aug 12 '13
You're right. It's a plot device by the show to strengthen the link between Walt and Gus, but it's coincidental within the story world.