Is It a Sin to Use Marijuana/Cannabis?

It's the same as alcohol, but with more of a warning. The Bible forbids getting drunk, and this includes not being sober in all of its forms.
It's the same as alcohol, but with more of a warning. The Bible forbids getting drunk, and this includes not being sober in all of its forms. The practical reality is that no one is using THC and not getting high. Smoked, vaped or eaten, the high is the point.
Now that marijuana is legal in a lot of places, including Missouri, this question comes up all the time. Dispensaries sell vape pens, gummies, chocolates, drinks and oils, and gas stations sell "hemp" products like Delta-8 that get you high too. Maybe you used before you followed Jesus, or your friends still do. Let's look at it honestly.
What the Bible says
1. The Bible doesn't mention marijuana, but it does talk about being sober. "Do not get drunk with wine, for that is debauchery, but be filled with the Spirit" (Ephesians 5:18 ESV). "Be sober-minded; be watchful. Your adversary the devil prowls around like a roaring lion" (1 Peter 5:8 ESV). The principle is clear: don't let a substance take control of your mind.
2. Here's the difference from alcohol. A Christian can have a beer with dinner and never be drunk. But with THC, the high is the whole point. Practically, no one is using it and not getting high, unless they're microdosing for the calming effects.
3. It doesn't matter how you take it. Whether you smoke it, vape it, eat it or drink it, THC does the same thing to your mind. Edibles can actually hit harder and last longer, because you don't feel them right away and it's easy to take too much. A gummy doesn't make it different from a blunt. It just makes it easier to hide.
4. Legal doesn't automatically mean wise. "'All things are lawful for me,' but not all things are helpful. 'All things are lawful for me,' but I will not be dominated by anything" (1 Corinthians 6:12 ESV). The question isn't "Can I use weed and still be a Christian?" The question is, "Is this pulling me toward Jesus or away from Jesus?"
You might be thinking…
"What about CBD?" CBD on its own doesn't get you high. If a product is truly THC-free and you're using it for something like pain or sleep, it's closer to a supplement than a drug. But read the label. A lot of "CBD" and "hemp" products have enough THC in them to get you high.
"What about medical marijuana?" If a doctor prescribes it for a real medical need, that's a different conversation, similar to taking any prescribed medication. Use it as directed, and be honest with yourself about your motives.
"It helps me relax." I get it. But if you need it to cope, that's worth paying attention to. God offers a better kind of peace: "Cast all your anxieties on him, because he cares for you" (1 Peter 5:7 ESV).
Next step
If you're using marijuana/cannabis in any form, ask yourself honestly: Could I stop for 30 days? If the answer scares you, talk to a pastor or someone you trust this week.
Related questions
Ephesians 5:18; 1 Peter 5:7–8; 1 Corinthians 6:12, 19–20; Romans 13:1; Galatians 5:22–23