![](https://cannabis.net/drive/1000/3743_Zjsh_twinswhosmokedweed.jpg?width=200&height=200)
“This study suggests that lifetime exposure to cannabis has few persistent effects on mental health and other psychosocial outcomes,” said the researchers. “We did not identify within-pair differences in cognitive ability… Cannabis consumption did not predict within-pair differences in psychoticism,” they added. In effect, lifetime consumption of weed didn’t lead to negative mental health outcomes among the sample.