I decided long ago to not take substances such as these, or even caffeine. I also abstain from tobacco, alcohol, and the like. This forced me to develop skill

I decided long ago to not take substances such as these, or even caffeine. I also abstain from tobacco, alcohol, and the like. This forced me to develop skills and discipline over the years to achieve self control, and this has more than paid off. I find I can work a 12 hour day, and then go in the next day and do the same. It doesn't seem like a huge deal to me - especially when I consider family members who are/were farmers where this is quite a normal work day and used to be quite normal for everyone until about WWII. Am I an outlier? I don't know, but I know others who have taken the same path with similar results. I've worked with many people who cannot function without caffeine, let alone other substances. They will often claim how it enhances their abilities, but it doesn't come across that way in my observations. They seem to be dependent on a substance for normal, or even sub-normal performance.