This is a lot of new words. Can you summarize these for me?
Yes, these terms can be confusing and are often used in misleading ways in the popular press.

People may start to Use alcohol or another substance for all sorts of reasons - or for no very good or specific reason at all.

The social Use of some drugs such as alcohol or cannabis may not result in negative consequences and may not progress to a problem of Substance Abuse.

Substance Abuse refers to excessive use, persistence of use despite negative consequences or evidence of loss of control over use of alcohol or another substance.

Some drugs are so dangerous that first use or any other use is clearly Substance Abuse. This is  true for any use of crack cocaine, methamphetamine, glue sniffing or heroin. Any use of any drug by injection is dangerous and by definition, Substance Abuse.

A seemingly unexplainable but driving compulsion to use drugs is referred to as Addiction. The emotional turmoil, denial, disordered thoughts and addictive behaviors are all symptoms of the sickness of Addiction.

Inherited vulnerability, family learning and the regular use of a substance to get ‘high’ are the most important reasons why some persons will develop an Addiction while others may not. 

An addicted person may or may not have a Physical Dependence on their drug or choice. Some drugs are more likely than others to cause Physical Dependence. Some drugs rapidly cause Physical Dependence while others do not do so at all.

Physical Dependence is largely a result of taking a certain type of drug regularly for a long time. The reason why you are taking the drug does not so much matter.

Sleeping pills of the benzodiazepine family or opiate drugs such as oxycodone, morphine or heroin are notorious examples of drugs that may cause Physical Dependence.

Taking a sleeping pill every night may result in a Physical Dependence, but not necessarily an Addiction. Regular use of an opiate drug to get ‘high’ will result in a devastating condition of both Physical Dependence and Addiction.

Drinking or using a drug regularly to change how you feel, to treat symptoms of social anxiety, relieve stress or to boost confidence may all indicate a problem of Psychological Dependence.

Self treatment of emotional symptoms with alcohol or drugs, habitual use and Psychological Dependence are all indications of Substance Abuse and may eventually result in Substance Addiction, Physical Dependence or both.

The tendency towards Addiction and risk of relapsed use may be life long. Active Addiction refers to a person with Addiction and who is actively using alcohol, drugs or is behaving in a way that will lead to use.

Abstinence refers to a person with Addiction but who is not using at present. Recovery refers to an active process of learning to enjoy life without the use of alcohol or drugs.

Cross Addiction refers to the expression of addiction in different ways and/or at different times in life. The Cross Addicted person may be addicted to both alcohol and gambling or may be addicted to crack cocaine when young and an opiate drug when older.