The addict is not the only one affected by symptoms of addiction. There are clear signs that the pain that is caused by addiction is clearly experienced by the people around them, the people who care about them.
Other devastating behaviour can also be caused by addiction to both (to themselves and others).
The situation goes downhill when the friendship starts to become turbulent and eventually degrades. This article as well as the others in this sequence tackles the impacts of addiction not only to the addicts but also to the relationships and people around them.
It is because friends want an ability to have natural relationships with their friends. The abusive use of drugs because of pressure leads to addictiveness that will eventually become harder for the recovery of both persons. This is one of the more infectious characteristics of addiction.
The circle of people you consider to be your friends will start to change slowly as addiction takes control of your life. This should be able to fix your sense of belongingness only that you find yourself belonging to people who seem to head to oblivion.
Being around with your new-found friends does more harm than good and will even make it harder for you to get well.