I stopped smoking about 2 weeks ago myself. Smoked small cigars (and I inhaled) and also shisha which is a water pipe. Just quit cold-turkey and it is working out ok.
One of the things that was supposed to be bad about shisha tobacco is that it has propylene glycol in it. I think as far as the E-cigs are concerned, that might be something to worry about. However, if it helps you stop smoking altogether, it might be worth the short-term risk for the long term benefits.