I smoked for nearly 40 years, I quit and failed many times because of similar junky thoughts as you've stated above.
This time I'm confident that it is my permanent quit because I have learned so much about the Nicotine addiction, and getting the tremendous support from members here.
I now realize that all the junkie thoughts about missing smoking because I thought it kept me calm, helped me relax, helped me concentrate, filled the emptiness, etc. were all lies.
I now realize that I was just simply an ADDICT who needed to feed the Nico