A drug or alcohol-dependent person can cause chaos for themselves and their family.
They may act irresponsibly - causing financial problems, difficulties at work or school.
They may lose the trust of family and friends by deceit and broken promises.
They may lie or steal in order to continue using drugs or alcohol.
They may feel shame and guilt from repeated failure in trying to control their intake.

And yet he or she will usually insist that there's nothing wrong ! !

DENIAL is a symptom of chemical dependency. It works something like this:
A person may like abusing drugs - either for the good feelings that it brings or simply to avoid withdrawal symptoms. He or she wants to keep on using the drug.
Yet he or she knows that the drug abuse is hurtful to themselves, their family and friends. And the individual loves his/her family and friends.
There's a subconcious conflict here that can't be resolved. The only way out of it is to deny that he or she has a drug problem - or that it's harmful to themselves or to others.

The person may really believe there's no problem, as this DENIAL is subconcious.

Chemical dependency is an illness which tells the sufferer that nothing's wrong!