大麻草が胎児に与える影響？？？

下記の記事が出ている。

　Surprise as scientists discover babies exposed to cannabis in the womb 'have better vision by the age of 4'
　Daily Mail: 24 November, 2015
　http://www.dailymail.co.uk/health/article-3332642/Surprise-scientists-discover-babies-exposed-cannabis-womb-better-vision-age-4.html