Show nicotine in tobacco nicotine Is a cn colorless orless intensely poisonous liquid it if exposed to the air it absorbs oxygen and becomes brown and ultimately solid the quantity of nicotine contained in tobacco varies franj born two to eight per ier cent the coarser kinds containing the larger arger quantity while the best havana cigars seldom contain more lhnn two per cent and often luss less nicotine does not nol appear in tobacco smoke it la Is split into pyridine and col lodine of these tin latter Is said bald to be the less active and to preponderate in cigar smoke while the I 1 smoke from pipes contains a larger amount of pyridine |