I don't mind informative advertising: "hey, we are making this thing which can help with this" is ok. But that's a rare breed of ads nowadays. One of the eye-openers for me was when I noticed in my early student (and shaving :)) days how all Nivea shaving products were branded as being for sensitive skin (does your skin turn red if you pull razor over it?): I've simply stopped buying their products. They've scaled back on that, but I didn't "forgive" them their attempt to manipulate me.
As a cancer survivor myself, I don't mind the analogy and term, it just seems to not be explicit enough about what the trouble is with ads today: you have to work backwards to establish parallels from "cancer" to "advertising".