Per Tradman:
Recreational use of Marijuana
“1. Opens the soul to demonic influence.
2. Weakens moral judgement
3. Promotes immorality
4. Fosters narcissism
5. Leads to moral pessimism
6. Is socially and morally divisive
7. Promotes laziness toward Catholic works
8. Promotes disobedience to priests and the Church
9. Promotes disobedience to secular authority
10. Is a safety issue for children who's parents use.
11. Causes neglect, and abuse of children by parents who use
12. Dulls sense of guilt and is counter to Sacrament of Confession
13. Profanes the reception of the Eucharist
14. Is falsely equated with moderate use of alcohol
15. Often leads to use of other drugs
16. Promotes secrecy and leads to animosity
17. Promotes other crime
18. Often destroys relationships
19. Impedes the desire to attain heaven
20. Leads to a liberal and worldly mindset
21. Retards emotions
22. Wastes opportunities for good
23 Impedes Christ's mandate to evangelize
24 Denies Scripture's command to stay sober
25 Denies the modest conduct of Our Lady
26 Leads to the unforgivable sin of despair
27 Is often its own object of worship
28. Causes certain kinds of brain damage
29. Often leads to other addictions
30. Inhibits holiness
31. Is well founded in paganism, abhorred in Christendom
32. Is proven by all the above to be a "sacrament" of the diabolic
This list is by no means exhaustive, barely even scratches the surface. After it exceeded 21, I figured this was enough to get the picture. If anyone disagrees, present your argument. Whatever you do, don't smoke weed, rather, do penance for the salvation of souls. “