Book Series

While I love book series (I seem to gravitate toward them lately), I wish there warning labels on the first book. I've picked up several and was unaware it was the start of a series as the book did not say. It was only after looking at reviews or finding the author on Amazon did I learn certain books were the beginning of series. I would like a nice large label which warns me I am about to embark on the torturous path of waiting for the next book. It will not prevent me from reading book one, or cause me to wait for all books to be published before I read-it would just be nice for my sanity to have a warning. So, now I have lost count of how many books I am waiting on in a series. Book torture is the worst!