??? ??? ??? Nicotine A very addictive chemical in tobacco products ??? ??? ??? Smokeless tobacco Tobacco that is chewed placed between the lower lip and teeth, or sniffed through the nose ??? ??? ??? Chewing tobacco Also known as dip or chew consists of poor-quality, ground tobacco leaves mixed with flavorings, preservatives and other chemicals ??? ??? ??? Snuff Finely ground, powdered tobacco