Experts looking for the root cause of the vaping lung illness outbreak may have found their smoking gun.

The Washington Post reports this morning that federal authorities are zeroing in on recent changes to the ingredients used in popular marijuana-vaping products.

For more KCBS Radio's Stan Bunger and Susan Leigh Taylor spoke with Peter Hackett, owner and operator of Air Vapor Systems, a Concord-based company that provides vape hardware and supplies to the legal market.