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.
Alcoholism is influenced by both hereditary and environmental factors. Addictions, particularly addictions to alcohol tend to run in families and it is known that genes play a role in that process.t has been said that the person with the genetic predisposition to alcoholism is an alcoholic at birth whether or not he or she ever takes a drink. Taking the drink initiates the disease into its active phase. The ability to stop drinking before becoming addicted lies ultimately in the hands of the drinker.