Nope. We already have enough stupid people in the world without having to worry about them being both stupid and stoned.
hate to break the news to you,, but it would blow your mind how many people are already doing it and you dont even know,
And many of them are quite intelligent.
Possibly even more intelligent due to the insight and perspectives due to the drugs.
As with alcohol, any perception of increased consciousness or insight while intoxicated is purely illusory.
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Alcohol is a depressant so mental activity is decreased.
That makes some people feel a lot better because they may be over worried about how others are judging them.
But other drugs clearly can increase mental activity, or at least cause one to reconsider things that they took for granted, without any introspection before.
Of course stimulants can also be over done, and then people do not take the time or have the patience to think deeply about anything.
In short, I think most of what we consider to be rational thought normally is what is illusory, and often drugs, even alcohol, can be an improvement.
We often to not really think about behavior we have been conditioned to, and an altered state of consciousness is often beneficial or an improvement because those habits of accepting what we have been conditioned to get challenged.