professor told me that is what you are supposed to do. It took my first year on CB, and links to supporting articles, to kill my desire to continue using the extra space. Logic won out, but the change was hard. After creating documentation for work I would have to go back over the entire document because a good third of the sentences all still had the double space and I wanted to give a clean document.
I've now been in remission for 4 years, 7 months, and 2 days.