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First of all in Eph 6:10-12 it refers to the "schemes of the devil". This writer was pointing out that Satan often follows a progressive pattern: distraction--addiction---destruction. " His goal is to reap destruction, but that's rarely his starting point. His usual opening is distraction. Scripture has a name for a small distraction that becomes a big distraction. It's called a stronghold. Scripture defines it as any and 'every pretension that sets itself up against the knowledge of God' (2 Cor 10:5). Anything that becomes a bigger preoccupation in your mind than the truth and knowledge of God, anything that dwarfs His truth and knowledge in your imagination, is a stronghold. In other words, if I have a relationship through which I can no longer prioritize Christ and His Word, Satan is building a stronghold there. If watching what I eat is no longer a means to better health and instead has become a major preoccupation, Satan is building a stronghold."
She goes on to explain how the distraction can become an addiction--its kind of like us turning something we have into a place where we live. Defeat becomes a lifestyle. She explains that the present level of satisfaction will soon lose its sensitivity and then we need to indulge in more. This is true with sensuality, but also true of all sin. We get caught in the furious cycle of continual lust (she is talking about all sin here). We have to remember that Satan's goal is not just addiction, but destruction. "He wants to destroy our lives, our callings, our sense of godly significance, our personal intimacy with God, and every relationship that matters to us."
I thought these were excellent points and we often forget that daily we are in a war like situation just by being Christians.