We all know the most common causes of back pain, such as heavy lifting, injury and degeneration.
But we may fail to realize that some of our habits and daily activities can cause or contribute to back pain.
In order of appearance, images courtesy of: Sander van der Wel, Titanas, MasonJars, planetc1, senekin, dan taylor and Webb Zahn.
Pain, Pain, Go Away 
Smoking too can have a big effect on back pain
http://health.howstuffworks.com/diseases-conditions/pain/back/smoking-and-back-pain.htm
Fibro Chick,
Thanks for posting that article. It was an interesting read. I never would’ve guessed that smoking would affect at a molecular level and that it could interfere with the body’s response to pain.