Blended optical techniques. There are many proprietary optical smoke measurement units including the 'nephelometer' or even the 'aethalometer' which use quite a few distinct optical methods, which include multiple wavelength of light, within only one instrument and use an algorithm to present a great estimate of smoke. DNA. Arsenic, https://broadfar.com/non-combusted-cigarettes-a-safer-alternative-or-just-a-myth/