how often are smears

If you mean Pap smears , the usual screening frequency is:

• Ages 21–29: every 3 years.
• Ages 30–65: every 3 years with a Pap test alone, or every 5 years with a Pap/HPV co-test.
• Over 65: often not needed if prior screening has been normal and there’s no higher-risk history.

If you meant smear campaigns instead, they can happen anytime someone wants to damage a person or group’s reputation ; there isn’t a fixed schedule. They’re often tied to politics, workplaces, public disputes, or online attacks, and recent reporting says AI has made them faster and cheaper to launch.

If you want, I can answer specifically for Pap smears or smear campaigns.