Yes. Steroid abusers become addicted, as evidenced by their continuing to take steroids in spite of physical problems, negative effects on social relations, or nervousness and irritability. They spend large amounts of time and money obtaining the drugs and experience withdrawal symptoms such as mood swings, fatigue, restlessness, loss of appetite, insomnia, reduced sex drive, and the desire to take more steroids.

   The most dangerous withdrawal symptom is depression, because it sometimes leads to suicide attempts. Untreated, some depressive symptoms associated with anabolic steroid withdrawal have been known to persist for a year or more after the abuser stops taking the drugs

   Also see, "What is the difference between drug addiction and dependency ?"

The breakdown product from nicotine (cotinine) may be detected in the urine for about seven days. The physiologic effect of nicotine is gone in about 14–48 hours. Nicotine can be extracted from hair for as long as several months. The physiological readjustment begins after the body detoxifies from nicotine, with the powerful conditioning effects persisting neurologically for quite some time.