What is rich about calling coffee a mind altering substance? Sensibility varies across people, but as an occasional drinker, if I drink a cup of coffee (especia

What is rich about calling coffee a mind altering substance? Sensibility varies across people, but as an occasional drinker, if I drink a cup of coffee (especially on an empty stomach), I get a strong buzz going for a solid 30 minutes or so. Not so different from a hit of nicotine (which I do not consume with any regularity either). As far as my own body goes, I have no problem working and focusing while drinking a beer. For coffee, I may have to wait until the caffeine buzz subsided before I can really focus again.