<human>: A co-worker of mine who retired about a year ago is coming back in a couple of weeks to work part time.  In the several years in which we worked in the same department, her body odor and personal hygiene was absolutely atrocious.  She also smelled very strongly of cigarette smoke at all times.  The combination would often make my stomach turn.

Several co-workers in my department used to talk about how strong the odor was, and would share tips with one another about how to reposition desk fans and share air fresheners in an attempt to alleviate their resulting nausea/headaches. 

Currently, there are two open desks and it's looking very likely that she will be using the one next to mine, and the other will be for a new hire.  I want to talk to my boss about my concerns and ask that the new hire take the desk next to mine instead.  

This will be an awkward conversation for me, that quite frankly I do not even know how to begin.  Any suggestions/insight on how I can make this request to my boss without sounding insensitive or mean spirited would be very much appreciated.  Thank you!!

Can you condense the text into three sentences or less?
<bot>: very smelly co-worker will likely soon be sitting next to me, how do I address my concerns to my boss?