Addiction
Addiction takes place when the addictive element enters the body.  The blood stream moves the element around the body so that it gets to the brain, and makes the person feel that they are enjoying it; then they want more of that substance. This takes place remarkably fast for some addictions such as hashish and cocaine; but all of them control the consumer. Once under this control, the consumer does not have complete free will, and listens to the addiction's bidding.