Willie Nelson on Marijuana

Willie Nelson speaks about cannabis legalization and his expectations for the future in the United States. Nelson believes that Colorado, Washington, and Oregon are pioneering the movement and that the United States will see legalization in all states within five years. Because cannabis has replaced a few other vices for him, Nelson also believes cannabis is not a gateway drug and though children should not partake, it will not lead to "harder" drugs. Nelson's new book "It's A Long Story" is in stores now. Footage: CBS This Morning