Ross's lymphoma was thought to have been caused by dichloromethane exposure from his odorless paint thinner (and him 'beating the devil' out of his brushes aerosolizing it).

It's now banned in paint thinners as a result of some pretty long lobbying efforts. It's a little sad, since chemicals like DCM are hard to replace, but if it saves the lives of our artists at the expense of them having a bit of a harder time cleaning their brushes, maybe we can live with that.