There's actually one STI that an abnormal smear might indicate: <a href="http://www.niaid.nih.gov/factsheets/stdhpv.htm">HPV, Human Papilloma Virus</a>. It's one cause of genital warts, though many infected people are asymptomatic. HPV is also a cause of various kinds of cancers: cervical, uteral, anal, and penile, to name a few.
I don't want to scare you here, but you're not totally off the hook. If you have any reason to believe you might be infected, you should go get tested ASAP.
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