Editor's note: Don't miss "Weed 2: Cannabis Madness: Dr. Sanjay Gupta Reports," at 10 p.m. ET on Tuesday.
(CNN) – It's been eight months since I last wrote about medical marijuana, apologizing for having not dug deeply into the beneficial effects of this plant and for writing articles dismissing its potential. I apologized for my own role in previously misleading people, and I feel very badly that people have suffered for too long, unable to obtain the legitimate medicine that may have helped them.
I have been reminded that a true and productive scientific journey involves a willingness to let go of established notions and get at the truth, even if it is uncomfortable and even it means having to say "sorry."
It is not easy to apologize and take your lumps, but this was never about me.
This scientific journey is about a growing number of patients who want the cannabis plant as a genuine medicine, not to get high.
It is about emerging science that not only shows and proves what marijuana can do for the body but provides better insights into the mechanisms of marijuana in the brain, helping us better understand a plant whose benefits have been documented for thousands of years. This journey is also about a Draconian system where politics override science and patients are caught in the middle.
Since our documentary "Weed" aired in August, I have continued to travel the world, investigating and asking tough questions about marijuana.
Pot and Girl Scout cookies.
What sounds like the punchline to a joke was a business plan for 13-year-old Danielle Lei.
She parked her thin mints and Tagalongs outside San Francisco medical marijuana dispensary "The Green Cross."
Sales lit up - the dispensary says she burned through 117 boxes in just two hours.
CNN's Kyung Lah has the story OutFront.
Was Justin Bieber flying high? Seriously, was he really smoking pot on his flight to New Jersey?
A law enforcement source tells CNN Justin Bieber and his father allegedly refused a pilot's warning to stop smoking pot during a flight from Canada to New Jersey on Friday.
The pilot also claims, according to the source, Bieber and his entourage were verbally abusive to the flight attendant.
CNN's Susan Candiotti is OutFront with the latest.
On the heels of President Barack Obama, who said marijuana is no more dangerous than pot and slammed the unfair penalties for some users - Texas Governor Rick Perry said that he supported his state's policies toward decriminalization of marijuana.
"What I can do as the governor of the second largest state in the nation is to implement policies that start us toward a decriminalization and keeps people from going to prison and destroying their lives, and that's what we've done over the last decade." Rick Perry said at the World Economic Forum in Davos, Switzerland.
His spokesperson the clarified saying the governor doesn't support the "L" word - "Legalization", but believes it's all about states having the right to make their own laws.
Similar to the White House Press Secretary Jay Carney, who also backpedaled his boss's headline grab on pot, saying the President's position on legalizing pot has not changed.
So why are all the politicians flirting with marijuana but no one really wants to commit? What are they afraid of?
OutFront: CNN'S Miguel Marquez, who's been covering Colorado's experiment with legal marijuana, Bloomberg Television Anchor Trish Regan. She's the author of "Joint Ventures Inside America's Almost Legal Marijuana Industry" and Former Senior Drug Policy Advisor to President Obama, Kervin Sabat.
The White House takes the high road.
Trying to blunt criticism from President Obama's comments that marijuana is no more dangerous than alcohol, Press Secretary Jay Carney said the President's position on legalizing pot has not changed.
The president, who has admitted to smoking pot had taken aim at politicians who throw pot smokers behind bars when they probably experimented with marijuana themselves.
So what does this mean for lighting up in the rest of the country?
CNN's Jim Acosta has the story.