Compulsion - is a desire / almost uncontrollable urge to drink or consume drugs . It works on the physical / emotional character .

Obsession - the purpose of your life is just one : consuming alcohol or drugs , whatever the price is , losing the ability to assess the consequences , minimizing them .

Control Loss - From the first consumption , the dependent ceases to control the consumption of the substance. With the progression of the disease he begins to adapt his life to consuming the drug (s) (s ) of choice , losing the ability to perform the simplest tasks without being under the influence of it. 
LIVES FOR CONSUME AND USES TO LIVE.