In the United States alone, approximately four million people are regular users of vapor cigarettes. Their usage, known as vaping, involves a smoke-free experience offers far more choice than tobacco cigarettes ever did. Also called electronic cigarettes or e-cigs, vapor cigarettes and vaporizers are designed to produce a vapor from a substance called e liquid, which is heated inside the cartridge or tank by an atomizer. (These parts are sometimes combined to create what is called a cartomizer.) Seen as convenient and a less costly alternative to smoking, there is also growing research that shows that it doesn’t carry many of the health risks posed by smoking, including lung cancer, emphysema, heart disease, and other chronic medical conditions.

So why are so many people choosing vaping over smoking? Here are the top three reasons why this trend is catching on across the country and throughout the world.

Reason #1: Smokers are getting tired of tobacco.

Each year, millions of people attempt to quit smoking, which can be incredibly difficult given how addicting tobacco is. In the U.S. alone, around 8.6 million people have developed a serious illness due to smoking. Vaping can make it easier to quit, according to certain studies. For instance, one study found that participants were 60% more likely to quit if they were vaping rather than using gum or patches or going cold turkey.

Reason #2: Vaping offers thousands of great flavors to users.

As of 2014, there were approximately 7,700 vaping flavors for sale; however, that number has since grown by at least 250 new e liquid flavors each month, according to a report by the New York Times. Everything from fruit flavors to coffee and dessert are available for sale, and usually for fairly low prices. The most popular tastes are fruit flavors, tobacco, and sweets, according to one survey, preferred by 31%, 22%, and 19% of users respectively.

Reason #3: Vaping gives users plenty of options.

Vaping is about more than flavor, though. Some users like to buy devices that have more of a “throat hit” similar to smoking, especially rechargeable electronic cigarettes. Those who are new to vaping may choose disposable e cigarettes for a convenient and easy to use way to vape. Others like to build their own vaporizers or customize their e-cigs. One thing that many people like that these devices come in wide range of colors and sizes, so they act just as much as an accessory as they do a way to get nicotine. And speaking of nicotine, users can choose any amount of the substance in their e liquid — even none at all!

Have more questions about choosing vapor cigarettes? Leave a comment below.