The chairman of the Subcommittee on Economic and Consumer Policy has requested that Juul turn over several documents to determine if the vaping products company purposefully marketed its products to consumers under 18.

In the letter sent to Juul’s CEO, Kevin Burns, earlier this month, U.S. Rep. Raja Krishnamoorthi, D-Illinois, said he is concerned about the numbers he’s seen linking Juul’s high nicotine content to youth addiction.