The only way there could be an illicit market is if the tobacco industry continued to produce it
There is no documentary support for that notion, but it is known that used pipes were placed in iron cradles and heat cleansed in bake ovens before being issued to the next round of smokers
Toxicology 466:153062 Lien YC, Wang W, Kuo LJ, Liu JJ, Wei PL, Ho YS, Ting WC, Wu CH, Chang YJ (2011) Nicotine promotes cell migration through alpha7 nicotinic acetylcholine receptor in gastric cancer cells
Other triggers are cold and dry air, mold, pets, dust, grasses, pollen, cockroaches, odors from chemicals, and smoke from cigarettes
Availability: These were limited to certain countries (Switzerland, which isnt in the EU, and some specialized e-shops in the EU)
The light will illuminate blue if the unit is fully charged and red if it is running low on power