You stopped smoking 6weeks ago and now have a metallic taste in your mouth why?

I am having same symptoms since last 5 weeks. I quit smoking 70 days back and had been smoking a pack for 18 years now. I guess lungs are coming back to life, this metallic taste has to do someting with the lungs. Sometimes it feels as if it is taste of blood, sometimes of rust and metallic. I wish everything is fine. Just one thing smoking screws you up, i hope i can turn my life around.