In 2014, 4,500 midterm ads promoted gun control. This year, more than 100,000 have already.

The mass shootings of the past few years may not have led to any major national gun policy changes. But gun control is playing a massively larger role in campaign advertising for the 2018 election than it did in the last midterm cycle.

While mentions of gun policy have increased across the board, a Wall Street Journal analysis published Tuesday shows, ad mentions supporting stricter gun control policies have spiked dramatically. In the entire 2014 election, the Journal's data counts just under 4,500 campaign ad mentions of pro-gun control messages. With more than a month to go in this year's race, those mentions have already topped 100,000 in 2018.

Guns are not only mentioned in far more ads now than they used to be, but the proportion of views represented has undergone a significant shift. In 2014, ads that mentioned guns were 600 percent more likely to oppose gun control policies as to endorse them. This year, they are about 50 percent more likely to call for more regulation instead of less.

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This change has been particularly striking in states, like Nevada and Florida, where mass shootings have recently occurred. Those two states alone "went from zero pro-gun control ads in 2014 to more than 45,000 this year," the Journal reports.