Regular exposure to THC, the main psychoactive ingredient in cannabis, during pregnancy has significant impact

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on placental and fetal development -- led to a reduction in birth weight of 8 per cent and decreased brain and liver growth by more than 20 per cent.

https://www.nature.com/articles/s41598-019-57318-6

ref - https://www.reddit.com/r/science/comments/eq5nw1/a_new_study_has_definitively_shown_that_regular/
 
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