True, Newbie, that's what I'm in the process of doing now with my 'rents. I think my dad knows, and my mom is a smart woman in the health field, so I play to that.

The whole "Yeah, I heard on the news..." thing about stuff you already know about pot works well, but only one "news item" every few weeks, otherwise, they'll be suspicious.

I've been working on it for 2 years, and I've got her mostly desensitized. Or I'll point out a famous genius who smokes, or make up a fictional friend's parent with a PhD or successful career who I "never thought they would smoke pot" and how intelligent they are in spite of it "How amazing!"

Get creative!