-Thepositiveeffectonthebrainmayexplainwhymanyofhistory'sgreatestscientistshavebeenavidsmokers-forexampleNielsBohrandAlbertEinstein,bothofwhompraisedtheeffectoftobaccoontheirscientificthinking.

Please segment the words:
- The positive effect on the brain may explain why many of history's greatest scientists have been avid smokers - for example Niels Bohr and Albert Einstein, both of whom praised the effect of tobacco on their scientific thinking.