Yup, and this is a huge part of why I don't consume caffeine in any meaningful amount (other than a random soda every so often). I had a friend who was addicted in middle school and tried to quit, and had to go back to drinking soda because of the headaches.

I don't want anything to have any meaningful control over me, so I actively avoid anything addicting. The most addictive thing right now. for me is video games, so I've set some rules for myself: no MMOs, generally avoid MP games, no mobile games (outside emulators). I don't drink, smoke, etc, and I prefer to manage pain without Rx (definitely avoiding opiates).

I've seen far too many lives get ruined through addiction. In fact, one of my life goals is to volunteer at a charity to help people kick addiction to consumerism (I'd love to help people get out of debt).

Addiction sucks, and I highly recommend others to be honest about their addictions and work to kick them. If you want some more motivation, volunteer at a soup kitchen or something and talk to the people there, many if not most got there through addiction, and a lot of them had a career before everything spiraled out of control. Don't let that happen to you.