"E-cigs have far less second hand smoke", by saying this, you come across as implying that ECigs (or E-NI's = Electronic Nicotine Inhalators) have some second hand smoke, just not as much as an analog cigarette. An E-NI does not produce smoke. Period. The "smoke" you see when someone drags on one of these is created when it heats the liquefied nicotine solution into a vapor. You inhale a vapor, not smoke into you lungs, where the nicotine is absorbed into your blood stream. The ingredient list for the solution I use is as follows:
USP Grade Propylene Glycol, FCC Grade Vegetable Glycerin, USP Grade Glycerol, Distilled water, Nicotine, Natural Flavors, Artificial Flavors, Citric Acid (as a preservative).
Everything in here, with the possible exception of the artificial flavor, is totally safe for human consumption.
I just started using a personal vape a few weeks back, and I have not bought any cigarettes since.