Is recreational marijuana use allowed in Judaism? Rabbi Yaron Reuven brings the Psak of Rav Moshe Feinstein in Iggrot Moshe Yoreh Deah that says it's forbidden to alter your mind intentionally, whether with marijuana or any other drugs. In this week's Parasha Nadav and Avihu get a Heavenly death penalty for just drinking a little wine before offering incense in the Mishkan.