There have been various claims and anecdotes suggesting that Albert Einstein may have occasionally used marijuana, but the extent and frequency of his marijuana use, if any, are not definitively known. There is no concrete evidence to suggest that Einstein regularly or habitually consumed marijuana.
There are a few popular stories that attribute quotes to Einstein regarding his views on marijuana, but it is difficult to verify their authenticity. One famous quote often attributed to him is: "The prestige of government has undoubtedly been lowered considerably by the prohibition law. For nothing is more destructive of respect for the government and the law of the land than passing laws which cannot be enforced. It is an open secret that the dangerous increase of crime in this country is closely connected with this."
However, it's important to approach such anecdotes with caution, as the exact details of Einstein's personal life and habits are not extensively documented. Einstein is primarily remembered for his immense contributions to physics and his revolutionary scientific theories, rather than his potential marijuana use.
It's worth noting that marijuana laws and societal attitudes have evolved significantly since Einstein's time, and it is now legal for recreational or medicinal use in various jurisdictions.