Versions of Iowa Code 124E.17 - Use of medical cannabidiol — smoking prohibited. on LawServer 2023 Iowa Code 124E.17 – Use of medical cannabidiol — smoking prohibited 2022 Iowa Code 124E.17 – Use of medical cannabidiol — smoking prohibited. 2020 Iowa Code 124E.17 – Use of medical cannabidiol — smoking prohibited. 2018 Iowa Code 124E.17 – Use of medical cannabidiol — smoking prohibited.