The atomizer is the heating element in an e-cigarette that produces vapor. There are many kinds of atomizers available in today’s market including, but not limited to, 510 atomizers, 801 atomizers, 901 atomizers, and 401 atomizers. Each atomizer differs in design and threading. Some atomizers produce more vapor, some atomizers produce more flavor, and some atomizers produce a better throat hit. Choosing the correct atomizer is entirely up to the user.