Johnson & Johnson said in a statement that it was disappointed with the verdict, citing “serious procedural and evidentiary errors in the proceeding,” and that it planned to appeal. As in past cases, which the company has fought with mixed success, it said decades of testing showed that its baby powder did not contain asbestos or cause cancer. Its shares fell 1 percent in trading on Thursday.

More than 13,000 plaintiffs have sued Johnson & Johnson over what they say are cancers caused by its talc products. The New York Times reported last year that the company had spent decades trying to keep negative information about the potential risk of asbestos contamination from reaching the public.

Ms. Leavitt’s complaint claims that Johnson & Johnson has, since the early 1900s, “possessed medical and scientific data that raised concerns regarding the presence of asbestos in talcum powder and that demonstrated the existence of health hazards to those exposed to asbestos-containing talcum powder products.”

Johnson & Johnson said in a regulatory filing last month that it had received subpoenas from the Justice Department and the Securities and Exchange Commission for more details about its talc products.