A new lawsuit alleges that Johnson & Johnson and more than a dozen other companies failed to warn consumers, as required under California’s Prop 65 law, that their talcum powder products could cause cancer.

The suit, filed Wednesday in Los Angeles Superior Court by Simmons Hanly Conroy and two other firms, comes six months after the dismissal of a similar Prop 65 suit against Johnson & Johnson. The new case alleges that defendants, in formulating cosmetic talc in 1976, included arsenic and other dangerous chemicals in their products that consumers know nothing about.