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 median household income is $81,894 in 2008-2012 and has grown by 29.24% since 2000. The income growth rate is about the same as the state average rate of 29.14% and is higher than the national average rate of 26.32%. Mckinney median house value is $186,400 in 2008-2012 and has grown by 25.86% since 2000. The house value growth rate is much lower than the state average rate of 55.15% and is much lower than the national average rate of 51.67%.