Yes, there is a suspected connection but studies are ongoing. The HPV virus, which is sexually transmitted, can also be passed along to the anus as well as the cervix. However, it should be noted that the majority of people with HPV virus do not have anal cancer.
ACS: Do we know what causes anal cancer?
http://www.cancer.org/docroot/CRI/content/CRI_2_4_2X_Do_we_know_what_causes_Anal_Cancer_47.a sp?sitearea
Medline Plus: Anal Cancer
http://www.nlm.nih.gov/medlineplus/analcancer.html
NCI: General information about anal cancer
http://www.cancer.gov/cancerinfo/pdq/treatment/anal/patient/
Until this issue is conclusive it would probably be wise to not smoke and to practice safe sex.
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