Why does my body go on a rampage if I don't smoke a cigarette before taking every thyroid pill?

I'm in need, I'm not well, I'm an addict, it's all a nightmare but I have to say it now: when I drink cola and smoke, the thyroid tablet is also broken down quickly, which is what my L-thyroxine level is telling me, even though I have an underactive thyroid.

I need L-thyroxine because of my thyroid but I am in a vicious circle because before every cigarette I notice that I need thyroid tablets because otherwise the cigarette does not taste good