; (B) the increased or decreased likelihood that existing users of marijuana products who are age 18 and under will stop using such products; and (C) the increased or decreased likelihood that those age 18 and under who do not use marijuana products will start using such products; and (2) impose restrictions on the advertising and promotion of products related to marijuana consistent with and to the full extent permitted by the First Amendment to the Constitution of the United States. 7. Grants for expungement of marijuana convictions There is authorized to be appropriated to the Attorney General to award grants to States and units of local government for the purpose of administering, expanding, or developing expungement or sealing programs for convictions of possession of marijuana $20,000,000 for each of fiscal years 2019 through 2023 with not less than 50 percent of those funds being directed to cover the cost of public defenders or legal aid providers. 8. Rule of construction Nothing in this Act, or an amendment made by this Act, may be construed to modify the authority of the Federal Government to prevent marijuana trafficking from States that have legalized marijuana to those that have not.