2.3 Instruments and equipment The experimental instruments include DF-101S collector-type constant-temperature heating magnetic stirrer (produced by Gongyi Yuhua Instrument Co., Ltd.), solvent-assisted evaporation and extraction device (produced by Beijing Xinxian Jingxing Glassware Co., Ltd.), DKB-501A super constant-temperature water bath (produced by Shanghai Senxin Experimental Instrument Co., Ltd.), and XDS5 composite turbine molecular pump (produced by Edwards, U.K.), DLSB-5-30 low-temperature cooling circulating pump (produced by Shanghai Baidian Instrumentation Co., Ltd.), Wechsler shunt column (produced by Beijing Halfsia Science and Technology Development Co., Ltd.), BF-2000 nitrogen blow-drying instrument (produced by Beijing Bafang Century Science and Technology Co., Ltd.), TRACE1310-ISQQD gas chromatography - mass spectrometry coupled with (produced by the United States of America Thermo Fisher Scientific), electronic analytical balance (produced by the United States of America), electronic analytical balance (produced by the United States of America Thermo Fisher Scientific)
The region remains the primary volume contributor to the global tobacco industry, supported by mass-market appeal and consistent daily consumption patterns
These results underscore the superior sensitivity of symptom-based assessments compared to traditional pulmonary function testing for detecting early respiratory health changes
Use of vaping products with nicotine concentration equal to or above 20 mg/mL or 2% among young adults was not significantly different from the other age groups (38%)
