The fall in the relative popularity of tank-type devices (Figure 32) didnt correspond with a fall in the absolute numbers of people using these devices (Figure 33), due to an increase in the number of vapers over the same period
Fan J, Zhou Y, Meng R, Tang J, Zhu J, Aldrich MC, et al
However, this did not extend to other tobacco products like e-cigarettes
This suggests most students had a modest budget typical of college youths in China
High-Nicotine Electronic Cigarette Products: Toxicity of JUUL Fluids and Aerosols Correlates Strongly with Nicotine and Some Flavor Chemical Concentrations
E-cigarettes are becoming the choice of more and more users