I quit 31 years ago after smoking for about 15. Quitting is a genuine PITA. It probably took me 5 years to quit and I tried all sorts of things. The final cure was when I burnt my toddler by accident. Not recommended, but it worked for me.

I have a subordinate who smokes e-cigs. I support her smoking them at work, on the job. I have far, far greater tolerance for people like her who are trying to quit than for puritanical sanctimonious intolerant Nazis who want to prevent her from doing so.

Smoke'em if you've got'em and best wishes to you!