[Puer]

The vast majority of Americans don't know/care what the active ingredient in Tylenol is because its effects have been extensively studied and tested and there's strong evidence consuming it over long periods of time has minimal to no harmful health effects.

The same cannot be said of marijuana.

[mikestew]

Read the sibling comment. Smoke all the cannabis you want, too much THC hasn’t killed anyone yet. The same cannot be said for acetaminophen, and it is in a lot of stuff that might be taken along with Tylenol, so people should care.

[fiddlerwoaroof]

As another commentor mentioned, Tylenol isn’t the best example here: acetaminophen is fairly dangerous and it’s not at all clear that it should be as easily available as it is.