Respect for health
2291 The use of drugs inflicts very grave damage on human health and
life. Their use, except on strictly therapeutic grounds, is a grave
offense. Clandestine production of, and trafficking in, drugs are scandalous
practices. They constitute direct co-operation in evil, since they
encourage people to practices gravely contrary to the moral law.
Even if one were to argue that marijuana is legal (which, in the United States, it is not due to Federal laws), not everything that is legal, is moral, so I would argue he is endangering his soul.
The Catechism also states:
Respect for the goods of others.
2413 Games of chance (card games, etc.) or wagers are not in themselves contrary to justice. They become morally unacceptable when they deprive someone of what is necessary to provide for his needs and those of others.
The passion for gambling risks becoming an enslavement. Unfair wagers and cheating at games constitute grave matter, unless the damage inflicted is so slight that the one who suffers it cannot reasonably consider it significant.
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