I Quit Smoking Cigarettes About 3 and a Half Weeks Ago. is It Normal to Feel out of It/ Feel Off?

I'm in the process of quitting smoking. It has been super hard for me. First I had to deal with anxiety and depression. Regular exercise helped me get through that. Now I feel like I space out a lot and sometimes I just feel out of it and "off". I also sometimes feel like I'm kind of going crazy. Has this happened to anyone else?

Suggestion:

Yep.
Relax. It will pass soon· 

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