I haven't seen data for THC, but for regular smoking: after smoking inside restaurants and bars was banned in Norway, the frequency of waitresses giving birth p

I haven't seen data for THC, but for regular smoking: after smoking inside restaurants and bars was banned in Norway, the frequency of waitresses giving birth prematurely or giving birth to babies weighing less than 1500g was significantly reduced [1]. [1] http://www.econstor.eu/bitstream/10419/67237/1/730406490.pdf http://www.econstor.eu/bitstream/10419/67237/1/730406490.pdf