420. Do you have it marked on your calendar? It's the international get high holiday in honor of marijuana.

I'm Laura Stasi, and I'm talking with a leading cannabis researcher who also has thoughts about dating.

Plus, only a few weeks before, they're all expenses paid honeymoon in Italy,

and a few days after they tape an episode of Family Feud, Golden Bachelor Gary and wife Teresa,

call it quits.

Smoke and Mirrors. That's coming up next on Dating While Gray, call it quits. Smoke and mirrors.

That's coming up next on Dating While Gray, the grown-ups guide to love, sex, and relationships.

You might not think to ask a marijuana expert for dating advice, but I did when I talked to Dr.

Peter Grinspoon. He's a primary care

physician, a cannabis researcher, and instructor in medicine at Harvard Medical School. Peter's

latest book is called Seeing Through the Smoke, a cannabis specialist untangles the truth about

marijuana. He is pro-pot, even as someone who has overcome a

prescription medication addiction that cost him his first marriage. You'll hear more about that in a

few minutes. But first, I told Peter about that time I came across a dating site profile question

asking if I'm, quote, 420 friendly.

I asked Peter if he thinks that's a helpful piece of information for determining romantic compatibility.

Absolutely. It's not that both couples have to smoke, but if one person was like intolerant of it or hated the

smell or had a bad experience with it and they didn't want to be around someone else who was

smoking it, that gives them a warning. I met my wife at Match.com, by the way. If both people are

420 friendly, it makes, you know, there are many other variables, but it makes the match that

much more likely to succeed. I feel like a lot of people my age, my makes, you know, there are many other variables, but it makes the mess that much

more likely to succeed. I feel like a lot of people my age might not take medical marijuana

...