Robbie Williams has vowed to quit smoking.The singer, who smokes up to 60 cigarettes a day, has already given up drugs and alcohol and now wants to kick another unhealthy habit. Robbie - who was fined recently for smoking on stage in Australia last week - is so desperate to quit nicotine he has even planned to visit a hypnotist on New Year's Eve. He said: "I want to give them up for good in 2007. Seeing a hypnotist on NewYear's Eve seems a good idea to me."The 'Angels' singer has made several attempts to give up cigarettes in the past including a fitness drive last summer. However, Robbie gave into temptation after just a few weeks - because he was worried about piling on the pounds. He admitted at the time: "I smoke loads and I really don't want to anymore. But I'm terrified of giving up. I'm a fat bloke inside this body and the minute I stop smoking, I will put on weight."Robbie's tour rider includes four packets of cigarettes and four ashtrays.The 32-year-old admitted this week he will never have children. Robbie, who has suffered from depression, says he couldn't bear to see his children experiencing the same agonising lows as him. In an interview with British magazine The Big Issue, he said: "I don't believe that to be fulfilled you have to have kids. What's the point?"I can't guarantee my child won't suffer pain - because that kid is going to be in pain at some point in their life. I don't want to see that. It's too much."