Have you tried acupuncture or homeopathic medicine? If not, those are two "alternative medicine" treatments that may help you feel better and cope with the side-effects of your parents' smoking. Another suggestion is to keep the door to your bedroom closed at all times (&
open the window frequently) so the smoke isn't as strong in there so at least at night you won't be dealing with as much smoke as is in the rest of the house. Also, you might try educating your parents about
the addictive nature of nicotine and the bad things it can do to them (lung cancer, emphasema, early death, osteoporosis, etc.) - here are some links you may find helpful in your discussion with your parents and sister:
I hope this helps - take care,
Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, Very Low Lymphocyte Counts (T-Cells & B-Cells), malabsorption/malnutrition, possible Lyme Disease (Igenex Lab IgM WesternBlot positive), etc.
Meds: Pulmicort, MaxAir, Injectable Vitamin B12, Herbs, Nutritional Supplements, Essential Oils, Homeopathy.