Idiot!
Idiot, professor, I mean. Just to be clear.
He is an idiot, a complete idiot which seems to be a requirement today for Professors. What will happen is that before he knows it, his tolerance for it will go up and he will need more and more to get his ‘high’ until it gets to an all consuming habit where he will focus on nothing else. Everything about his life will go out the window, his family, his health, his job, eating, bathing and very fast he will end up on the street like a zombie a complete slave to heroin.