Writing a story and I need a disease that is easy to hide until the final stages with a short life span?

I'm writing a story and one of my characters is suppose to die, I need a disease that is easy to camoflauge until the final stages when its too late and fatal. Preferably one with a life span of three months at the most. My character is sort of an alchoholic as well as a chain smoker, so that might help to... show more I'm writing a story and one of my characters is suppose to die, I need a disease that is easy to camoflauge until the final stages when its too late and fatal. Preferably one with a life span of three months at the most.

My character is sort of an alchoholic as well as a chain smoker, so that might help to narrow possible sicknesses as a result of those bad habbits.

All help appreciated!
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