Editing Cluster headache (section)

===Tobacco smoking===
About 65% of persons with cluster headache are, or have been, tobacco smokers.<ref name=Nesbitt2012 /> Stopping smoking does not lead to improvement of the condition, and cluster headaches also occur in those who have never smoked (e.g., children);<ref name=Nesbitt2012 /> it is thought unlikely that smoking is a cause.<ref name=Nesbitt2012 /> People with cluster headaches may be predisposed to certain traits, including smoking or other lifestyle habits.<ref name="pmid18474191">{{cite journal |doi=10.1007/s11916-008-0022-5 |pmid=18474191 |title=Cluster headache and lifestyle habits |journal=Current Pain and Headache Reports |volume=12 |issue=2 |pages=115–21 |year=2008 |last1=Schürks |first1=Markus |last2=Diener |first2=Hans-Christoph |s2cid=29434840 }}</ref>