What you do in the privacy of your own home is your business :) Victimless as it were.
That said, should you find yourself in a health emergency, as I did, and hooked up to a dilaudid drip for weeks, as I was, you may find experience with the symptoms of withdrawal to be quite useful for getting yourself through the worst of it, as I did.
Withdrawal is part of the human experience you don't always have a choice to avoid. Fear, avoidance, and ignorance of it makes potentially involuntary encounters with drugs more dangerous. Besides fueling unnecessarily destructive policy decisions.
Cool, my decision to not use caffeine is justified then.