It's a good question for a physician, unfortunately I am not, but I will be one one day. but I took Chemistry and biology at college, so I know that coffee is diuretic that means a substance that makes you want to ("encourages you") pee many times and that's why you will lose a lot of water, if you drink only coffee Cigarettes contain the same substance that is used to kill rat, cancer causing compounds and hundred known toxins(see.www.man-health-magazine-online.com/chemicals-in-cigarettes.html for details) We know that water is essential for our body, A person who strikes and doesn't want to eat and drink might die after 1 month( It depends on many circumstances (physical condition, for example diabetic, overweight etc, etc). I read an article several years ago about somebody who striked and refused to eat and drink and he died after 1 month) but he didn't lose a lot of water, because he didn't drink coffee. Cigarettes make things worse. I think somebody is lucky ,if he can survive on coffee and cigarettes after 1 week. Like I said I am not sure about this, since I have never heard about anybody who did such "experiment"

If you eat the cigs you might survive longer than of you smoke them. But I aint no docture

I can survive all morning on them.

I am sure he wont last as long as he wud have , had he starved completely.

Coffee - if thats all you drank, well lets hope its very weak as the caffeine is not good for you. If it has a little sugar in it - I suppose that will help mildly for energy levels, but basically it owuld be like living on just water. You would slowly drain away. As for the cigarettes. Will assuming you aim to smoke them they would help you reach your maker much quicker. We know they cause cancer but that is unlikely to happen in a short time. But as you weaken from starvation, smoking on a cigarette is only going to drain you more. So Coffee and Chocolate bars (with nuts) might be a more interesting question

I've gone 72 hours at a time like that before succumbing to some crappy diner food. I work in advertising.

About a week! please dont try this at home!!!!!!