I know it's probably harmless, but this is one of those things that I rather wait before trying it out. You never know, there could be very small hidden side effects. The brain is so complex and poorly understood that I rather not mess with it in this way.

Examples: maybe this will make you likelier to have a brain seizure when you are just 60 years old, maybe after prolonged use one region of your brain is more active making you behave differently (could be positive or negative), maybe it will make you more susceptible to Parkinson, Alzheimer, etc...

That being said, if everyone was as coward as I am, we would have missed on lots of inventions.