The only requestor condition I have is that I don't want books that smell of cigarette smoke and I have stated so in my profile. But the swapper canceled the transaction for another reason--because she wants to give the book to someone else! This is a little annoying. Will the swapper be penalized at all for this or is there any way I can report it?

That is just awful. They should not have it on their shelf if they don't want to send it  or at least just say it does not meet your conditions; and then you would never know. Do we penalize them for honesty?  What if there had been no RC on the book? 

It could very well be that she was trying to post it to someone else's Wishlist and it messed up for some reason.  Sure it is disappointing to you but, should she be penalized for an error?  It happens.....

I just wanted to point out, if you don't already, you need ot have an actual RC about the cigarette smoke and not just have it in your profile.  I know I personally never, ever look at the profiles of someone I'm sending a book to-I just don't.  I look at their WL to see if I have something they're looking for and that's all.

Also I think you should cut them some slack.  I'm sure the day will come when you post a book by accident, or can't find one that's been on your shelf for a long time, or post a WL book and then have a family emergency or accidentally damage a book after it's been requested or your annoying Aunt Myrtle comes over and brow-beats you into giving her a book you have out to send to someone. 

If they have a habit of cancelling book requests 1: they won't earn any credits and 2: PBS will give them a warning.

No, they will not be penalized unless they repeatedly cancel books, that is probably grounds for flagging an account. Mistakes happen. When a wishlist book is posted the ONLY way to undo it is to wait until it is accepted and THEN cancel. If they had spilled a glass of water on it instead and couldn't send it because it was now unpostable the same thing would have happened. It's unfortunate, but I doubt it was done with malice.

I just had a children's book that I'd posted get requested and when I went to wrap it I saw a light crayon mark on the Title page. Since I hadn't noticed the mark before posting, I notified the requester and offered it as a free unpostable if she wanted to order another one from my shelf. So I cancelled the request and removed the book from my shelf and waited for her to place an order for another book.  She was very understanding and PM'd that she was glad I had double checked and let her know before wrapping.  So other things do happen!

Members should only post books they are ready to swap with general PBS membership Hannah. 

That said, there are variables (real life happens)...as mentioned (and I did this) it can be confusing when first learning how to post directly to another members wishlist and if done incorrectly the books goes FIFO.  Although it would have been more tactful if your message read 'posted in error' or 'cannot find book'  -  complete honesty can sometimes cause hurt feelings and misunderstandings.

If smoke odor is a problem for you, then a profile comment will not be sufficient (and leaves you no recourse if ignored or not noticed).  I also do not look at the profile of members before mailing.  So you will want to set up an RC to cover your needs.