I admit that I don't know who Tyler Cowen is, but millions (billions?) of people have drunk coffee daily for centuries and if there were ill effects in the same ballpark as opioids or tobacco by now we would certainly know?
Hey, let’s not discount the opinion of some internet guy just because of the lived experience of the rest of humanity throughout history. /s
There is even a decent chance that the Industrial Revolution and the phenomenal wealth and progress it's brought was caused by the introduction of coffee to Europe.