The first time I ran into this error, I had a good chuckle. Working with their API is always fun, even when you mess up.
Yes. His opinion is probably "managers make worse decisions while high" => "Weed is bad for business." Which is not the same as "The weed business is bad."
He may have been engaging in controversy to sell his book at the time
As a die-hard fan of recreational marijuana use I can tell you from personal experience that you really should be sober at work. Not only does drug use at work destroy your productivity, it also blurs the distinction between work and pleasure. While this might seem to “enhance” your working experience at first, it also devaluates your spare time and precipitates burn-out syndrome. That knowledge might be trivial for most people, but this seems a good place to spell it out.
'too much' implies that there is an acceptable and responsible level. kind of like 'drink too much beer'.
You can approve of and partake in an activity while also realizing that excessive use is detrimental. Like drinking.