Please do not start another marijuana thread.  In 2021 there were at least 4 such threads. Rarely does a multiplicity of threads on the same subject bear more or better fruit.

Agreed.  It's why I barely participated this time.  What's frustrating is that the Catholic theology regarding the matter can easily be summarized in two sentences, and it has been summarized early in this thread and so it needn't have continued.

Theologians agree that taking a substance to the point of completely losing control of your higher faculties (to where you can no longer engage in moral reasoning) is grave sin ... without a grave justification for it (e.g. surgery, relief of extreme pain, etc.), and that lesser degrees of impairment of those faculties can be justified (i.e. not sinful) for proportionately less grave reasons.  If these "incomplete" impairments (their term) are not justified for such proportionate reasons, they'd be venial sins. 

Done. 

If you want to add a third sentence it's that certain extrinsic considerations can render its use gravely evil, such as if I am risking my job (at a place where randoms are taken), or risking prison, or taking one of those substances that can cause instant addiction to the point where people ruin their lives over it, or even just breaking a just law without (again) proportionately serious reason. 

What a waste of time.  I submit it's due to a lot of Traditoinal Catholics in the US being somewhat poisoned by Puritanical attitudes, something which we saw also on some other threads.  I doubt we'd be having this debate in, say, most of Europe or Latin America.

For what purpose do they need the THC for?

Marijuana (rightly) has a stigma attached to it that makes it seem trashy. The smell is enough to render it much more disagreeable than alcohol or tobacco.
Weak argument as someone can use a vapouriser completely bypassing the smell and health defects of smoke.

Look at the members of society who abuse marijuana and what type of people they are. By smoking marijuana, you would be casting your lots with them.
 Strawman. Plenty of successful people drink alcohol, and plenty of 'unsuccessful' people drink alcohol. By driving a car you are like bad drivers? Or are you like good drivers. "Look at people who abuse alcohol"

There is more to the argument than simply the ability or inability for marijuana to cause the complete loss of reason.
Overuse of alcohol can also cause the loss of reason. Why are you using that marijuana usage = getting high?

1) Stigma attached makes it completely scandalous and in most traditional circles will result in complete irreparable loss of reputation.
No one said anything about public use or around trads

2) Scientific studies have proven beyond any doubt that marijuana use destroys brain matter, causes insomnia, contributes to the development of schizophrenia in adulthood, and makes you gαy, etc, etc.
Some of these are just outright lies (making you gαy ) . Also people can develop the same issues from alcohol. Schizophrenia for example has to do with those who have dispositions for it...

3) I have friends who had smoked marijuana daily before becoming traditional catholic. They are unanimous in agreeing that marijuana use is 100% a mortal sin.
Sounds like someone who lacked discipline and now projects that onto others. "I drank alcohol everyday that means drinking alcohol is 100% a mortal sin"

4) Not an academic argument, but look at Rome (built by alcoholics) vs Portland (built by stoners)
modern alcohol is very different from past alcohol, pesticides, cleaning Chemicals used on the barrels and other factors. Where the romans drunk or just had some alcohol?

5) The only reason a sheltered traditional catholic child would ever try marijuana is because they were given the impetus to as a result of some gαy rebellious desire, which presumes that they know that it is stigmatized and bad.
"The only reason a sheltered traditional catholic child would ever try ALCOHOL/CIGARS is because they were given the impetus to as a result of some gαy rebellious desire, which presumes that they know that it is stigmatized and bad."

6) Its gαy and retarded
You already had ridiculous points earlier but this is clearly nonsense (aka brainwashing cope, there is no logic and reason here)

7) Just drink alcohol like your European ancestors have for 6000 years
A certain Catholic saint used marijuana for health reasons perhaps you've heard of Saint Hildegard? Also you do realise that many plants were used by people in the past before Jєωιѕн companies banned them because of (((reasons)))?

8) "Ohhh brrruuhhhh I feel so chilll right now brruuhhh" it makes you talk and act like a retard. Whereas alcohol amplifies charisma in the charismatic, industriousness in the inquisitive, and geniality in the sociable.
you are comparing someone high to someone who had a little of alcohol. If you have too much alcohol you also become retarded. Also alcohol doesn't effect everyone in the same way.

1) Stigma attached makes it completely scandalous and in most traditional circles will result in complete irreparable loss of reputation.

That's not what scandal is and I don't think we are obligated to cater to other people's erroneously formed biases. That's their problem to fix, to hell with human respect 

2) Scientific studies have proven beyond any doubt that marijuana use destroys brain matter, causes insomnia, contributes to the development of schizophrenia in adulthood, and makes you gαy, etc, etc.

Alcohol can destroy brain matter and cause insomnia. Schizophrenia development is associated with heavy use of high THC cannabis. Just as with alcohol, moderate use of lower THC cannabis will not be significantly harmful and it is used (successfully) for a variety of therapeutic reasons

3) I have friends who had smoked marijuana daily before becoming traditional catholic. They are unanimous in agreeing that marijuana use is 100% a mortal sin.

Doesn't matter what your friends think. 

4) Not an academic argument, but look at Rome (built by alcoholics) vs Portland (built by stoners)

Stereotyping

5) The only reason a sheltered traditional catholic child would ever try marijuana is because they were given the impetus to as a result of some gαy rebellious desire, which presumes that they know that it is stigmatized and bad.

See above

6) Its gαy and retarded

See above

7) Just drink alcohol like your European ancestors have for 6000 years

See above 

8) "Ohhh brrruuhhhh I feel so chilll right now brruuhhh" it makes you talk and act like a retard. Whereas alcohol amplifies charisma in the charismatic, industriousness in the inquisitive, and geniality in the sociable.
 
See above

(I do not consume alcohol or use cannabis)