In 2015, more than half of the 44,000 people who committed suicide did so using a firearm, according to the Centers for Disease Control and Prevention, and people with access to a firearm in the home are three times more likely to die by suicide or murder than those without. However, public opinion has not yet caught up to these and other studies that show restricting access to guns lowers suicide rates.

The lack of awareness about gun ownership and suicide risk comes as gun control once again is in the public discourse following a mass shooting in a Florida high school. The event reignited debate over the link between gun ownership for mass shootings, but a study published in the Annals of Internal Medicine shows few Americans grasp the connection between gun ownership and suicide.

In the study, researchers examined responses to the statement: “Having a gun in the home increases the risk for suicide.” Of the 3,949 persons who completed the survey, only 15.4% agreed that having a firearm increases risk of suicide. “The connection between guns at home and suicide fatalities can’t be understated,” said Kris Brown, co-president of the Brady Campaign, an anti-gun violence nonprofit.

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Public belief varied widely by demographics, according to the study: 1 in 3 health-care providers agreed having a household firearm increases suicide risk, while fewer than 10% of gun owners with children agreed with the statement. What’s more, 20% of people who don’t have guns in their household agreed with the statement, while just 6% of gun owners agreed. Options for participants included “strongly agree,” “agree,” “neither,” “disagree,” and “strongly disagree.”

The National Rifle Association, which spent more than $26.8 million on advertising leading up to the 2016 election, plays a role in the lack of public knowledge about the fatal effects of having weapons in the home, Brown said.

Gun advocates argue that suicidal people would ultimately find a way to kill themselves, regardless of whether guns are restricted, but states with universal background checks saw a decrease of 0.29 suicides per 100,000 people from 2013 to 2014, according to the National Center for Health Statistics. “That undercuts this notion that someone intent on committing suicide will eventually follow through on it,” Brown said. “We know it’s simply not true.”

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For instance, the highest suicide rate among black men is among detectives and police officers (2.55 times), professions that have ready access to firearms, according to the Centers for Disease Control and Prevention. (In a similar vein, white men in the medical profession who have access to potentially harmful pharmaceuticals are more likely to take their own life than the average population.)

“Despite strong empirical evidence that restriction of access to firearms reduces suicides, access to firearms in the United States is generally subject to few restrictions,” a 2013 study published in the American Journal of Public Health concluded. To purchase seemingly innocuous cold medications such as Sudafed, consumers must not only show photo identification, but also have the purchase logged in a database. In contrast, less than a dozen states and the District of Columbia require registration of some or all firearms.