User blog comment:TheMasterBeliever/Side Effects/@comment-5650217-20130103051510/@comment-5650217-20130103060724

That's another superstition, much things have sense but that doesn't mean are truth.

In fact the only case I known of probable physiological damage is Nina Kulagina's one, which I suspect died due to adrenal glands exertion, caused by her method of using Tk by emotional pressure.