Do you enjoy smoking? Or still trying to quit?

I smoked a lot in my late-teens. I told everyone I loved it. I believed it. But it wasn't true.

A few years on, it was normal for my friends to ask, "are you smoking at the moment?". It was a running joke. Because I'd quit cold-turkey for a few weeks, then quickly be back chain-smoking in the pub garden. Like a human yo-yo.

But why?