Lyric discussion by kebab 

Cover art for Not That Funny lyrics by Fleetwood Mac

I can't hep think this song is about some kind of addiction.

Lines like But you can't get enough of it

and

All your hope is gone It's not that funny is it?

What's not too funny is realising you can't beat the addiction.

No, this song is about relationship troubles, as are all Fleetwood Mac songs.