You've never taken ANY mood altering drugs including coffee and you fell into a paranoid dilution [sic] when you had nitrous oxide at a dentist office. For some reason I am not surprised. I also assume you don't exercise because of the mood-altering endorphins produced.
Normal human behavior falls along a continuum where some pleasant things are allowed in life. The taste and social enhancements of fine scotches, wines and coffees are some of those things that can enhance life's experiences, and yes, make you a better person. Really, just eating food makes you feel better. True, placing oneself at one end of the bell curve where these things are used excessively is negative and pathological behavior, placing oneself at the complete other end of the continuum seems just as pathological to me.