I had these symptoms when quitting cold turkey.  I literally slept on towels woke up with my head spinning similar to the exorcist.  I was waiting for myself to start speaking backwards Latin and spew green stuff across the wall.  Your post made me google quitting smoking + cold sweats and many others on allexperts had similar symptoms.
I have also heard sweating is a way for your body to shed toxins or harmful things.  Another poster has said this and it may be because analog cigarettes contain other chemicals than nicotine.  I know when I tried to switch from Marlboro to Camels I felt like crap, besides the usual stuff related to smoking, until I switched back.
The post about PG and VG may need to be looked into also 
Old thread, needs bumped because I learned a lot from it.