[...] An e-cigarette will aerosolize a liquid and create anywhere from large amounts of vapor to very small amounts of vapor; the different products on the market create different amounts of aerosol. A Nicotrol inhaler delivers nicotine predominantly to the oral mucosa where it is absorbed. There is no heating involved in a Nicotrol inhaler.
Another important distinction is the difference between an e-cigarette and burned conventional tobacco. When you burn conventional tobacco, you are heating that tobacco to about 1000˚ C; [...]