Answer:
Is there a chemical that can be introduced to your body that will not harm you to some degree, after near or long term exposure. I think not so I could only speculate that research will review that this chemical or herb will prove to be determental to your health as well. I WOULD SMOKE IN MODERATION IF YOU CHOOSE TO DO SO AT ALL. I would not want to be the one that determines that yes in fact it does cause brain damage. Enjoy