Hi, I'm 60 and I never had psoriasis until I quit smoking 6 months ago. That is very strange. My husband thinks my immune system over-reacted after not dealing with smoking anymore and it went crazy. Psoriasis is on my lower legs and my scalp. It first popped up on my arm but hasn't come back there. The lower legs isn't so bad since I don't wear shorts and there's no pain, but the scalp is difficult to deal with. I'm picking my head in the middle of the night without even realizing it. And I'm tired all the time for no good reason. My palms are peeling occasionally and also the bottom of my feet. I wonder if my husband was right and my immune system just freaked out.