Can my sisters negative lifestyle affect me mentally and emotionally?

Hi dpc! I will tell you something: the life of the people we love, and I guess you love your sister, will always affect us emotionally. One day is your sister, the other your mother, and if you have kids, are your children. So is life, we get affected by the people we love. Now the question is: how much it affects me, can I make it easier to me not to be so affected, not to feel it as a very heavy experience? It depends. Let's say your sister is using heavy drugs and drinking, being agressive with you or something like that. You can keep some distance if you want (I would) , if you notice that you cannot help her. You will protect yourself a little bit. But you will never get rid of being affected. If what she does is something that doesn't affect her relationship with you, and only is something bad to her , I wouldn't keep a distance. There are people in our lives that we love  who do things that we would never done, but if they take care of the relationship with you why moving away? And stop all connections I would never do, just in case of insanity where my life would be at risk. I think we should always keep at least one open door to the ones we love