It is true though. When you really want to, stopping isn’t that hard. I chain smoked for 13 years. And then the time came when I really wanted to stop (I had an upcoming marriage and just needed that money). And because I really wanted to, I did stop.
I’d still suggest to make a plan beforehand though. Mine were nicotine free cigarettes. They really helped my hands to stay occupied and, even more important, I still could go on a smoking break at work from time to time. I let that fade out slowly.