Is Cannabis a Gateway Drug?

The fear was that if you use cannabis, then you're going to be led down this pathway. And I think at this point, we can say that this is not a cannabis thing. There are other drugs where if a animal is exposed to that particular drug early in life and then exposed in adulthood to another novel substance of abuse, that will increase their drug taking as well. So there are a lot of other factors that go into substance use in populations even beyond just what types of substances that individual is exposed to.