Although many of the negative effects of cigarette smoking are widely known by the general public, its effects on bone healing are not realized by many. Smoking has been shown to have deleterious effects on bone healing and lead to decreased rates of fracture healing and increased rates of complications.
If you have a fracture and smoke, your fracture has given you the perfect reason to quit smoking. It is highly recommended to avoid smoking while recovering from a fracture.
Further reading on smoking and bone healing:
http://www.aofas.org/footcaremd/how-to/foot-health/Pages/How-Smoking-Affects-Healing.aspx
http://bmjopen.bmj.com/content/6/11/e010303.long
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3686151/
http://orthoinfo.aaos.org/topic.cfm?topic=a00192
Additional Resources (Smoking Cessation):