[YT video="34vTEk_hO34" title="" description=""] In the wake of the tragic death of 31-year-old "Glee" star Cory Monteith, Fox News host Bill O'Reilly reached out to Dr. David Sack, CEO of Promises Treatment Centers, to talk about what O'Reilly called the widespread acceptance in society of alcohol and marijuana. Monteith, who was found dead July 13 in his hotel room in Vancouver, British Columbia, died as a result of “mixed drug toxicity,” according to the B.C. coroner's office. Monteith had struggled with addiction since he was a young teenager. "The attitude toward marijuana changed," Dr. Sack said, "when we started to get legalization. There's a perception that marijuana is safe, if not helpful, but the evidence is to the contrary. Marijuana, especially when used by adolescents and young adults, affects future development and thinking." Dr. Sack went on to say that over time, the daily use of conscious-altering substances catches up with people. They start to miss work and have problems in their relationships. "Marijuana is a very insidious drug," Dr. Sack said. "People don't know how it's affecting them. They're not aware of how it causes them to be more irritable, more paranoid, more oppositional. It's a particularly difficult drug...