When it comes to vapor production, it would go to lung hits hands down. You can try it yourself, notice more vapor when you draw it in directly to your lungs? If you aren’t used to lung hits, you most probably will be coughing while trying to attempt this. If you are trying to increase vapor production, master this vape technique and you will become a cloud chasing master. Also, try lowering your nicotine level because it smacks you harder when you vape this way.
Also, with the new sub-ohm tanks coming out, they were specifically made for these lung hits. Other features like wide bore drip tips help draw in more vapor to your lungs.
My advice to anyone who isn’t used to lung hitting is to adjust the airflow to the smallest setting and do your normal mouth to lung hits and gradually work your way into the lungs.
Of course, there is no correct way to vape. This all depends solely on your preference. Remember, mouth to lung for flavor, lung hits for vapor!