I NEED my mom to stop smoking! It's gonna drive me crazy!?

Okay so here is the worst part. I have asthma and I think she caused it! My sister has it and my brother does to but it doesn't seem to effect him anymore. My mom lied to me and said she quit and when I was looking for a piece of spare paper to write down a number in her car (she wasn't there) I found a pack of cigarettes! This was about 2 or 3 years ago and when I told my dad he said to confront her and I did and she said "Oh, Angela I know you don't like the fact that I smoke but it is very hard to quit" then I get upset and she will be like "Angela don't get upset!" like it's my fault she smokes! I can't stand it anymore and now we are having more and more lessons on tobacco products and mmarijuana nd drugs and it scares me! I almost cry in cl and it is sooo embarring! I DON'T CARE IF IT IS HARD TO QUIT! SHE DOESN'T CARE THAT IT UPSETS ME! Now she is in Vegas and I'm sure she is smoking even more and she is with my aunt who also smokes (more so actually) and her best friends says "bad words" a lot and smokes A LOT and I don't like her that much and it's just so hard! I have stress issues and can cry pretty easily. When I asked my mom how she started she said a group of friends did it so she did it to (peer pressure) and I just couldn't believe it! MY MOM got pressured to smoke! It is all so hard to take in. I need her to stop! Please help me