In young adults, peer pressure is also a risk factor for addiction. Though it might not be overt or aggressive, the pressure from friends to fit in or be accepted can create a breeding ground for addiction to take root. The availability of a substance, as in the case of a college student having easy access to drugs or alcohol, may also make it much easier for a young adult to become addicted.
Environmental factors can be so strong that an addict in recovery usually needs to avoid certain situations or people that could trigger a relapse. The people you used to use drugs or drink with may need to be kept at a distance. Cravings may surface around certain people or in certain places. This is true even after a long period of sobriety.