The Rolling Stones guitarist - who has battled with drink and drug addiction in the past - had promised girlfriend Sally Humphreys he would ditch his nicotine habit but he is finding it hard.
A source told the Daily Express newspaper: "Ronnie has really tried to knock smoking on the head but it`s one sacrifice too far. He told Sally he was going to give it his best shot but it just wasn`t too be. He`s done amazingly well removing alcohol and drugs from his life and cigarettes are the only vice he has left."
Ronnie, 65, announced last November he was trying to give up the potentially-fatal habit but admitted it was a very tough thing to do.
He said: "The cigarettes are the hardest ones to crack but I mean to do that this month."
Ronnie - who began dating producer Sally earlier this year - has been pictured out several times smoking electronic cigarettes in a bid to conquer his habit although has also been spotted inhaling the real thing.