First, I would like to say something to duffsmom. I do believe that it does take a special person to help you learn how to nurse. Of course you can experiment until you're both comfortable. However, I'm sure helps to have someone who knows exactly what's what to help you out, especially if you've never done it before.
Secondly, I would definitely show that nurse the door and report her. It is unacceptable to show up to a person's house reeking of smoke like that. If you are a professional that is going to be around a new mother and child, there is no way you should be smoking before hand.