“Does the fact that cannabis is increasingly legal mean that addiction rates are going to spike and related issues – such as lower IQs and higher rates of marijuana addiction – are also going to jump?

I believe the answer is no…

This is not to say that drugs of abuse in general, and cannabis in particular, are benign. Indeed, they are addictive and can harm brain development. But decriminalizing or legalizing drug use makes sense because it reduces crime almost immediately, frees up police for more serious matters and will likely not lead to higher rates of use.”