Everyone has the right to enjoy cultural life. This right applies equally to all without discrimination, including people who use drugs recreationally, people who use drugs for cultural, spiritual, or religious purposes, people who need controlled substances for medical purposes, and people who cultivate illicit drug crops as a traditional way of life.
In accordance with this right, States should:
i. Refrain from discriminatory and otherwise unnecessary or disproportionate interference with the exercise of cultural practices and with access to cultural goods and services on grounds of drug control law and policy.
ii. Take necessary measures to ensure the preconditions for participation in, facilitation of, and promotion of cultural life without discrimination, including access to and preservation of cultural goods where these involve controlled plants and substances.
iii. Foster a rich and diverse cultural life through the conservation, development, and diffusion of culture and by ensuring the participation of relevant communities in the governance of cultural heritage, including where these involve controlled plants and substances.
Here is where you will see the cited reference for the Commentary feature.