By Anne Marie Helmenstine, Ph.D. Combustion Definition: Combustion is a chemical reaction chemical that occurs between a fuel and an oxidizing agent that produces energy, usually in the form of heat and light.Related Articles.ombustion Definition: Combustion is a chemical reaction chemical that occurs between a fuel and an oxidizing agent that produces energy, usually in the form of heat and light. Related Articles.
It is important to note then that whether a person decides to use alcohol or drugs is a choice, influenced by their environmentâpeers, family, and availability. But, once a person uses alcohol or drugs, the risk of developing alcoholism or drug dependence is largely influenced by genetics.Alcoholism and drug dependence are not moral issues, are not a matter of choice or a lack of willpower.hen an animal eats a certain food that it likes, there is an advantage to associating pleasure with that food so that the animal will look for that food in the future. In other words, the genetic potential for addiction is hardwired into our brain. But some people are better at knowing when enough is enough.
While scientists have known for some time that genetics play a role in alcoholism and other addictions, they also understand the tendency to be dependent on alcohol is more complicated than the simple presence or absence of any one gene.onsidering that alcoholism seems to run in families and so appears to be a gene-based disease, there are questions concerning the fact that binge drinking â consuming five or more drinks in a row for a man, or four drinks for a woman â leads to the faster development of alcoholism.