Sir Paul McCartney is glad wife HEATHER forced him to quit smoking marijuana - because he makes more sense since he's stopped taking the drug.

The rocker took up the habit after sharing a joint with Bob Dylan in the early 1960s, and only recently weaned himself off it when new wife Heather Mills protested.

And he says, "I've talked to people who've said, 'You're conversation is so clear these days. It all used to be a little hazy.' And you thought you were having a good time.

"I have quite a liberal view (on drugs) but I find that I prefer to be straight."