I do not believe it affects your adsense account but it is not a good idea to have the exact same article on more than one website. I have found that topics on which I write can have multiple articles using a different approach. I believe an article is considered to be the same unless more than 25% is different when posted on more than one website.
I have written hundreds of articles and I am fairly new (less than 1 year) to hubpages but I have found a great site on which to post articles. My approach with respect to multiple websites on which I post articles is to decide the type of articles you will post on each. In this way you have a niche for each website and broaden your perspective and expertise. This can only help expand your recognition as an expert.