my aunt has 4 brain tumors and lung cancer due to 45 years of smoking. she didn't even realize anything was wrong until the tumors were getting so big they started pressing on parts of her brain. she is only 61 years old. doctors say she'll be lucky if she lasts another 12 months. to get something like this from anything other than smoking, you would have to be working in some pretty hazardous conditions or expose yourself to harmful chemicals on a regular basis. 
i used to smoke but quit when i was 21, 7 years ago. my girlfriend smokes but is working on quitting. no way i want to go through what my uncle is going through now. to think everything is fine one day then the next finding out the person you spent the last 40 years with won't be around for 41 
