Apple has removed all apps relating to vaping from the App Store, citing warnings from health experts that the spread of vaping products and e-cigarettes constitutes a “public health crisis and a youth epidemic.”

“[We’ve] updated our App Store Review Guidelines to reflect that apps encouraging or facilitating the use of these products are not permitted,” said Apple in a press statement. “As of today, these apps are no longer available to download.”

“As of today, these apps are no longer available to download.”

The iPhone maker stopped accepting new vaping apps in June, and it has never allowed the sale of e-cigarette refills or vaping cartridges on its platform. A total of 181 apps have been removed from the App Store, including games and companion apps that let users control things like lighting and heating on vaping devices. Apps already downloaded will remain usable.

Apple’s actions come at a time when concerns about vaping products have ramped up in response to a mysterious vaping-related lung injury that’s killed at least 42 people. The exact causes of the injury are unknown, but the Centers for Disease Control and Prevention (CDC) said last week that a chemical thickener added to vaping products might be involved.

Related Everything you ever wanted to know about the vaping health crisis

Before this wave of lung injuries, there were other concerns about e-cigarettes and vaping products. These included dangers from exploding batteries and seizures and high levels of vaping among teenagers. Last December, the US surgeon general declared youth vaping a “public health epidemic.”

Apple says its decision to remove vaping products from the App Store was directly triggered by warnings such as this. You can read the company’s full statement, via Axios, below: