Hungary, Slovenia, Sweden, Finland, Canada, New Zealand, Singapore, Belgium, South Africa, Estonia, Germany and Russia are all preparing to introduce the plain tobacco packaging laws soon
Steptoe A, Ussher M
Most air purifiers (not just smart ones) have sensors that measure the density of various airborne pollutants such as nitrogen dioxide (NO2, a toxic gas from car exhausts and power plants), PM2.5 (particulate matter smaller than 2.5 microns in size, including industrial emissions and tobacco smoke), PM10 (particulate matter up to 10 microns, including dust, mold, and pollen), and VOC (volatile organic compounds, or potentially harmful gases from things like cleaning products and paint)
McCaffrey recommends starting with learning your limits
The mini-dry pouches weigh 0.4 grams each and are available in nicotine strengths of 3 mg and 6 mg