title_body: Will coffee taste different from a cup with lid (blocking the smell)?
upvoted_answer: Yes.  You should remove the lid for maximum effect.  Somewhere around three quarters of our perception of taste comes from smell.  There are varying figures out there, but most are fairly high.  
  
  However, much of that comes from the olfactory sense when the molecules pass from our mouth to our sinuses.  So, having a stuffy nose is more likely to reduce the taste of your coffee than drinking it with the lid on.  That being said, the aroma from brewed coffee tends to dissipate fairly quickly, so you might only need to leave the lid off your cup for the first few minutes of your "coffee experience".