How does alcohol and drug abuse affect a relationship?
Suspending moral judgments, one has to consider the nature of the relationship in it's basic structure; i.e: parent to child, sibling to sibling, child to parent, loved one to loved one; and then be aware of any changes in behaviors when the substance is in use and, or,is being abused. Various drugs and compounds will have effects that differ from individual to individual in varied circumstances. One has to take into account 'HOW' the substance is being used. Is is used to make one feel good, to alev iate negative feelings? Is the user so addicted (accustomed) to the substance that non-use results in negative behaviors?
Are you enabling your person to continue abusive use of the substance: i.e.; look the other way, join in, approve, remain silent, provide it, hold it for them, provide them positive atmosphere, location, venue? How do feel about this?
How are you effected by the persons use and or abuse? Are you clear here? Have you honestly and clearly expressed your position, without judgment and expectation? How do you feel about this?
Drugs and alcohol can effect a relationship between two people in much the same way as a third person can. But, with a third person, you can't pour them down the sink, but you can leave.
All organisms seek health in their circumstances. Using a substance to cope with circumstances is one way towrds health, but depending on the circumstances,it can be very costly.