Dust, insects, moisture, and general wear can affect the devices ability to detect smoke accurately
While many leading brands compete on prestige, rarity, or refined taste profiles, Double Happiness competes on emotional recognition and social meaning
Other companies depicted smoking patients in their ads, recommending medications for the conditions caused by smoking, rather than trying to aid physicians in prevent these diseases by educating the public not to smoke (see the centers exhibition Depictions of Smoking in Pharmaceutical Advertising)
Others have independently replicated the use of this latter syringe and non-destructive 1 H NMR method in a relatively newer e-cigarette model, and found that 1a-d comprised a significant percentage of the total formaldehyde in the aerosol of a different e-cigarette 16
Disposable vapes are cheap and a no-brainer to use, which is why they are the go-to choice for rookie vapers