@Xyz Joke aside, not "me" saying but Science so mb you ought to check more 😏
For instance... According to Science, nowadays outdoor CO2 concentration equals what was the indoor concentration thirty years ago, with obvious nowadays indoor concentration even higher. Said CO2 impacts/"impairs" cognitive functions, meaning the more CO2 in air, the dumber humanity becomes.
Or you can also look for medical studies explaining how addictions impair cognitive functions as well.