However, the use of hemp in paper-making dwindled due to the prohibition of cultivating hemp in the 1930s. This prohibition was because hemp comes from the same species as marijuana. However, hemp is a different strain and doesn’t have THC - the psychoactive ingredient in cannabis Sativa.

The 1937 Marihuana Tax Act made the cultivation of hemp and cannabis illegal. Not only that, the textiles and newspaper industry used their lobbying power to end the cultivation and production of hemp.

https://www.trvst.world/sustainable-living/hemp/hemp-paper/