Marijuana is not harmless. Do not use it.

This is a warning for anyone willing to hear it.

Marijuana is often discussed as though its effects begin and end with relaxation, intoxication, or pain relief. But marijuana affects the mind, and one area deserving serious consideration is its relationship with sleep and dreaming. THC can alter normal patterns of dreaming, and marijuana use and withdrawal can affect how dreams are experienced and remembered.

That matters because dreams are not necessarily faithful representations of reality. A dream can contain events that never occurred. It can construct conversations that were never spoken, actions that were never taken, and experiences that never happened. And sometimes a dream can leave behind powerful emotions or confusion after a person wakes.

The danger is not merely that such a dream exists. The danger arises if something originating in a dream becomes confused with waking reality. This is something Marijuana can contribute to.

A person can dream that a trusted friend betrayed them when no betrayal actually occurred. They can dream that somebody insulted, rejected, threatened, or mistreated them when that event never happened. A dream can even contain an apparent episode of past abuse that did not actually occur.

If a person comes to believe that something happened when it did not, the consequences can extend far beyond the dream itself. Trust can be damaged. Friendships can be destroyed. Families can be divided. Anger or fear can be directed toward someone for something that person never actually did. Decisions made on the basis of a mistaken belief can have consequences that cannot simply be taken back.

This is one reason I believe marijuana should not be treated casually.

There is also a much older question here

Human beings have wrestled with the significance of dreams for thousands of years. Philosophers and theologians have disagreed profoundly about their origins. Plato connected dreaming with aspects of the soul and desires ordinarily restrained during waking life. Aristotle approached dreams much more naturalistically. Christian thinkers such as Augustine and Thomas Aquinas considered both natural explanations for dreams and the possibility of spiritual significance, while emphasizing the need for discernment.

From a Christian perspective, that question becomes particularly important. Christianity teaches that spiritual deception is possible and repeatedly calls people to discern what is true rather than accepting every impression simply because it feels convincing.

If something feels real, that does not make it real.

If something appears in a dream, that does not establish that it happened.

And if an apparent memory emerges around a dream, its emotional intensity does not prove its historical accuracy.

So the warning is stronger than a calculation of risk

And if we know that marijuana can interfere with dreaming, sleep, perception, and recollection, I believe the appropriate response is not merely to ask how much risk is acceptable. My warning is stronger:

Do not use marijuana.

Guard your mind. Guard your relationships. Be extraordinarily careful about anything that can affect the boundary between an experience generated by the mind and an event that actually occurred.

And if a disturbing dream appears to reveal something about another person — betrayal, abuse, hatred, deception, or wrongdoing — do not condemn that person merely because the experience felt real. Stop. Seek corroborating evidence. Talk to trustworthy people. Pray for discernment if that is part of your faith. Separate what you know happened from what you dreamed happened.

A dream can be powerful.
But reality must be established by reality.