What are the different types of units to a human?

I want a list that describes all the dependencies for a human being. Please help me.

In general, the drug is the use or consumption of a substance used to respond to changes in the psychological behavior, and chemicals in the body and mind. Substance abuse is the excessive use of an object or a chemical that has dependency-inducing agents trigger a chemical reaction wrong. Fight against addictions can be of various types, such as: 1. Alcohol and Drug 2. Smoking and Addiction 3. Nicotine 4. Marijuana 5. Hashish 6. Internet surfing etc. For more information try this link http://www.findmedicaladvice.com/addiction/types-of-addictions.html