"i would suggest anyone on this, to stop or take a break once you&#039;ve noticed your reasoning, memory recall abilities becoming hindered.  even though i&#039;m happy with the benefits of focus, it&#039;s not worth losing your short-term memory.  overtime, i noticed my math skills declined, followed by my word recall, spelling and now i can&#039;t remember stories or study material.  it&#039;s extremely debilitating, i&#039;m trying to figure out how to reverse the side effects."