Katie, you are not upsetting me.
I feel that you are dodging the issue, that you do not fully accept what your choice to smoke may mean to you in later life.
But that is not the same as you upsetting me.
You are an adult and as you say have the right to smoke. I feel that with that right comes the responsibiliyy (which you owe to your kids), to make that choice in the full knowlege of what smoking does.
I don't believe, for one nano-second, that if you were diagnosed with terminal cancer that you would have no regrets.