I have experience with Weed and I know the effects it has on teens brains (probably the age of a lot of the people at the concert) and she is and idiot for saying this.
Miley you need to get through this phase but i'm not gonna stand by and support you anymore.
Research has not proven anything harmful, long-term affects of weed on your brain.
There are many healthy, intelligent people who smoke weed everyday. The only affects are short-term memory loss and minor things like that.
Nothing shows that it's unhealthy, minus the smoke. However, marijuana smoke is proven to be better for you than tobacco smoke.
I'm not the one living in delusion when the marijuana movement is growing and expanding. You are stuck on the stereotype of marijuana which is false. You haven't tried it so you can't tell me that it affects the brain. You have no idea. Two states have legalized it. You're the one that is delusional.
Those affects are from casual recreational use. There's severe consequences for frequent users. Keep researching.