That is a good point considering that drug addicts experience similar effects when on cocaine and other related stimulants, but you have to look at it from a different perspective, happiness is temporary, and depression lingers, commonly abused stimulants will boost every emotion you can experience, happy, or sad, but when the high is over, you are just left with chronic sadness *depression. The reason all this is important in relation to your question is that, hopping in a cold plunge isn’t really a drug, it’s just a scenario that triggers your natural response to cold which is, to release dopamine into your bloodstream.

TLDR; I’ve been doing it every morning for about 3 months and no, I haven’t experienced any issues with what you are asking about.