I have never taken up the practice of smoking but obviously I have known many who have. Most folks I know that have given up smoking completely have done so for their family (children) my parents did the same. Over the years I have seen many try and struggle. I never understood why they could not give it up, that nasty habit. But over the years I begun to understand habits and the pain involved to stop. I will never truly understand addictions like smoking, drinking, drugs, and the type that are apparently deleterious to ones health. But I do understand eating disorders, which I share.
My addiction / disorder has helped me cope with the addictions of others.
My point is, many folks say "just do it". It's not that easy and hurray for those with the power to do so.
The key is self control, everything in moderation and people supporting you.
Good luck to you all and keep trying. I've gained 30 lbs in 7 years but I'm holding... Keeping my face out of the frig helps... go figure.