All the chemical engineers I know (I know a few) are pretty happy. Most find their work interesting.
All the humanities academics I know (I know very many, having been one in a former life) are more or less unhappy. Many find their day to day work uninteresting and unexciting.
Chemical engineering is a high-demand field. Not many people's dream job.
Humanities academia is a low-demand field. Many people's dream job.
I think "work in a high demand field" is better advice for any young person than "do what you love," with or without qualification. Especially if they are the sort of young person who wants to be passionate and interested in their work.
Doing the hyperspecialized Hot Field of the Day may be a bad idea, but perennials like [software] engineering, K-12 education, finance, nursing, medicine etc. are generally going to be the best use of an intelligent student's time.
Low-demand fields mean a lot of down time due to lack of funding or lack of employment. That kills passion. High-demand fields mean there's always something to do and a new problem to solve. I think that's more important for actually loving what you do.