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Originally Posted by ginkgo  I take cold showers when the weather is warm. This is common knowledge about the hot water having more toxins in it. I use a water purifier, but if you use tap water for tea, get the water cold and then heat it up for this very reason. I had read that years ago. It takes a minute or 2 for your body to get used to the cold water.
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I believe the effect described is different than the danger of drinking hot tap water. Hot tap water can have trace amounts of lead or other elements from the pipe. However with a hot shower, it is not that the water has more chlorine than a cold shower, but way more gets into your system because you inhale far more vapors.
As an alternative to cutting - the endorphin rush is probably similar. One thing that slightly disappoints me is that I don't seem to get as much of an endorphin rush as I used to. It's still significant though, and it is summer, so the water is a little warmer.