If I smoke marijuana once in a while, am I commiting a mortal sin?
These links should answer your question about marijuana and drunkenness being grave matter. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
*]Are recreational drugs immoral?**
]* Driving under the influence**
]* Does being drunk reduce culpability?**
]* Is Mortal Sin subjective?**