Once a longer life becomes a real option, everybody will choose it if he can.
That is not what currently happens. There are big differences in the way people age, and when they die. Many of them can be linked to lifestyle decisions, some are well researched, and a few even widely known due to public propaganda. And still people smoke. If a quick/fix, a pill, o something that looks like treatment becomes available that might change. But at the moment much of what actually can be done to improve life quality, length, or probability of surviving is just not done.
Depending on the details, many people may even reject "quick fixes that look like treatment" to death and disease.
See for instance the conservative response to the HPV vaccine Gardasil, which prevents the most common strains of the virus that causes genital warts -- and thereby drastically reduces the risk of cervical cancer. By providing a "quick fix" to protect sexually active women from a deadly disease, Gardasil reduces the "punishments" available for an action (or "lifestyle") disapproved by conservatives; therefore, they reject it.
Last Wednesday (2010 Dec 01), BBC Radio 4 broadcast a studio discussion on the question: "should we actively try to extend life itself?" The programme can be listened to from the BBC here for one week from broadcast, and is also being repeated tomorrow (Saturday Dec 04) at 22:15 BST. (ETA: not BST, GMT.)
All of the dreadful arguments for why death is good came out. For uninteresting reasons I missed a few minutes here and there, but in what I heard, not one of the speakers on any side of the question said anything like, "This is a no-brainer! Death is evil. Disease is evil. The less of both we have, the better. There is nothing good about death, at all, and all the arguments to the contrary are moral imbecility."
Instead, I heard people saying that work on life extension is disrespectful to the old, that to prolong life would be like prolonging an opera, which has a certain natural size and shape, that the old are wise, so if we make them physically young then old people won't be old, so they won't be wise. Whatever cockeyed argument you can construct by scattering into a Deeply Wise template the words "old", "young", "wise", "decrepit", "healthy", "natural", "unnatural", "boredom", "inevitable", "denial", I heard worse.
If I can bear to listen again to the whole thing just to check I didn't miss anything important, I may write something on their discussion board.