Co-signing a 6 month lease for someone else. How does it effect me if I did.....?

Basically how does that show up on my credit? Have someone that is moving to Chicago and needs a 6 month lease co-signer. What effect does this have on my credit rating? Does it show I have a 6 month agreement even though its for someone else? Am planning on buying a house within this period and was wondering if it will effect my home purchase since I will have my name on a $2000 per month lease in Chicago. Good or Bad idea to co-sign? Thanks and appreciate your advise(s).