Jordan Peele, the comedian turned horror-movie director, recently made a video meant to give American voters shivers of dread.

It showed President Barack Obama giving a speech he never gave, and uttering sentences that he didn’t actually say. The video demonstrated how easy it is to use current technology to create powerful and persuasive lies, now also known as fake news.

When this video magic is coupled with the ability of companies like Facebook to micro-target each of us and select the news we see, the implications for the future of our democracy seem dire. Fake news and microtargeting can be combined to create a kind of advertising that’s like an evil version of Reese’s Peanut Butter Cups, and we are being exposed to more of these pernicious morsels every year.

But two lessons from the history of advertising suggest that the fake news phenomenon is likely to change significantly in the years to come. Prospects are gloomy for the near future, as this kind of advertising extends beyond politics. History also suggests, though, that the danger will probably recede over time as people grow accustomed to the ads, which will cease to work as effectively.