Nicotine is a nitrogen-containing chemical-an alkaloid, which is made by several types of plants, including the tobacco plant. Nicotine is also produced synthetically.Nicotiana tabacum, the type of nicotine found in tobacco plants, comes from the nightshade family.icotine is a nitrogen-containing chemical-an alkaloid, which is made by several types of plants, including the tobacco plant. Nicotine is also produced synthetically. Nicotiana tabacum, the type of nicotine found in tobacco plants, comes from the nightshade family.
8.25% The Mckinney, Texas sales tax is  8.25% , consisting of 6.25% Texas state sales tax and 2.00% Mckinney local sales taxes.The local sales tax consists of a 2.00% city sales tax.
Mckinney is part of Collin County. Mckinney has 62.21 square miles of land area and 0.67 square miles of water area. As of 2010, the total Mckinney population is 131,117, which has grown 141.16% since 2000. The population growth rate is much higher than the state average rate of 20.59% and is much higher than the national average rate of 9.71%.