Getting cigarette smoke taste out of my mouth?

I don't smoke, never have, never will. Grew up around it my whole life, and the smoke makes me sick, like feverish-nauseous sick. Not to mention that neither of my parents have teeth anymore, and they're young, in their early 40s.

But I'm friends with the old night-shift guy that works at our local gas station, and he asked if I wanted to stand outside and talk while he smoked, and I said yes, because I love night-shift guy.

However, during the conversation, I noticed that when I talked, I was exhaling smoke and started trying to subtly distance myself from him, and tried to blow the rest of it from my lungs when he wasn't looking because I didn't want him to feel bad, he really is a sweet guy.

After another customer rolled up, he put it out and went back inside, I wished him a good night, and headed home, but now my mouth has that sickly green taste that I grew up hating.

I swished some water around and spit it out, I tried drinking some of my fruit drink that I bought, but now I just feel like I'm covered in smoke and I feel like I can taste it still.

I'm fortunate this time to have a smelling disability, but I can still taste it

So how can I stop tasting it :(