Is cigarette smoking a sign of selfishness? so many times my sibling who smokes like a stove pipe will not step out when i've told her it's suffocatin

Cigarette Smoking: In this case I consider it to not only be selfish, but to be harmful if you are being forced to deal with second-hand smoke. Even if you are not in the room when she smokes - there will be off-gassing after the fact. My personal opinion is that if someone decides to smoke - that is their own personal choice. It becomes dangerous to others when they force that decision on other's by contaminating

Second hand smoke: .... is toxic to others. Maybe your sibling will respond to some facts about what he/she is doing to your health. See: https://tinyurl.com/jqbs8vg and https://tinyurl.com/yaada6g6 . Hope this helps.

Unacceptable: This is open aggression. Smoking is noxious and unhealthy to others. You should not have to tolerate this. If your sibling is in your room, tell him/her to leave. If you are in your sibling's room, leave. If the relationship ends, it probably wasn't worth maintaining. If other family members take the side of a sibling like this in the 21st century, they're probably not worth keeping either.

Yes, but...: Nicotine addiction is a powerful addiction, probably worse than alcohol or opiate addiction. Addicts’ judgment is impaired by their addiction. They make excuses and can convince themselves that it’s others’ problem, not theirs. You can’t reason with them. YOU have to take steps to protect your health until & unless your sibling decides on her own to take action.

Do not cohabit: Agree with Dr. Fowler. If you can help it, do not be in the same room with her. Do not invite to your home and do not go to her home. You can only control your behavior, not hers. Wish you good health! - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Drink enough water daily, so that your urine is mostly colorless. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form. Practice safe sex, if you have sex.