Human: I have heard that there are new types of e-cigarettes. What are they? Assistant: 
There are a few different types of e-cigarettes, but the most common ones are disposable e-cigarettes and rechargeable e-cigarettes. Disposable e-cigarettes are pre-filled with nicotine liquid and come in many flavors. Rechargeable e-cigarettes are refillable and can be recharged by plugging them into a USB charger.