whoah popa, lets be fair and honest here.
i lost a great deal as well and kept it off (the loss was over 5 years) and it was easy for me.
BUT
and this is a very big but
losing weight and keeping it off is for 99.9% of people who need to EXCEEDINGLY DIFFICULTand pretty close to impossible. quite a bit harder than stopping smoking which is a matter of totally rejecting something which you cant safely do with eating.
we all know this from experience and very clear large studies as well (if you go in for such things)
although it is popular now for overweight people to claim they are happy with how they are, many of them would sacrifice many things that are dear to them if they could lose the weight they so wish to.