Based on the Scenario, the process is described as Mitosis
During this process , chromosomes in a cell nucleus will be separated into two identical set of chromosomes (which make it four) and will end up in their own nucleus
During mitosis the parent cell divides into two daughter cells which are identical to each other and to the parent cell. Mitosis increases the cell number. The number of chromosomes remains the same. During mitosis the DNA is duplicated in the parent cell and then passed on to the daughter cells. There are five phases of mitosis i.e. Prophase, Metaphase,Anaphase, Telephase and interphase.
Nicotine, once in the brain, will work specifically on nicotinic receptors in the brain. However, there is a common "addiction" pathway in the brain that pretty much all addictive substances go through.
