Narcotic gum really exists. For example, in China there are chewing gums that contain betel nut, a very distant analogue of nasvay, whose distribution is prohibited in Russia. Betel is an evergreen plant whose leaves have long been used as a tonic. In order for the active substances to be better absorbed, they are chewed together with slaked lime. But chewing for a long time is dangerous, it leads to gum inflammation and tooth loss, and also increases the risk of oral cancer. However, in Eastern culture, the gift of betel leaves is a sign of reverence and respect.
True. In general, you can mix any substance that can be ingested into the gum. Another thing is that the problem will be that the taste will be very unpleasant due to the strong bitterness of the substance, and it will be simply disgusting to keep the gum in your mouth, it is impossible So no one does that.