Expansion ratiothe ratio of the volume of air to foam solution in the finished foam is one way to measure foam effectiveness
What a chain smoker
Automation Level: Manual, electric, semi-automatic, or fully automatic
Airflow Sensor or Button: Some e-cigarettes have an automatic airflow sensor that detects when the user takes a puff and activates the heating coil
Dimensions: 2585 x 3867 px | 21.9 x 32.7 cm | 8.6 x 12.9 inches | 300dpi Date taken: 26 October 2017 Location: Dali, Yunnan, China More information: Various traditional pu-erh tea cigarettes made from fermented pu-erh tea leaves, a tobacco-free alternative found in the markets of Dali Old Town, Yunnan, China on October 20, 2017.
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