People don't improve without help or guidance. That goes for all of us, in many aspects of life. To shame people who suffer is to ostracize them, and this will not solve the problem, it will exacerbate it.

If you really want to shame people, then shame the politicians and industry executives that are peddling unhealthy foods and eating habits. Maybe when we've leveled the playing field enough so that healthy food is cheaper and more readily available than unhealthy foods, then you can start shaming obese people like you're shaming smokers now.

You are shaming smokers as fervent as you wrote your post, right?