You're so uneducated about marijuana that this is my gift to you:
There is no link between weed and lung cancer, there is no link to other lung diseases that are commonly caused by Tobacco. They are two VERY different plants. Don't make an ass of yourself by assuming they cause or do the same things to the human body. The worst lung damage that smoking weed can do is cause chronic bronchitis, or chronic pneumonia, and that has only been recorded by people who smoke pot for literally decades.
Seriously, I know people who have been smoking weed daily for over 50 years, and they are completely normal.
Also, did you know that over 50% of the White House staff admitted to smoking pot within a year before their hiring date? Obama (regardless of whether you like him or not, he's still the President of the US) was actually a HUGE pot smoker when he lived in Hawaii. He actually invented "total absorption" with his friends, which means that every time you take a hit of a pipe/joint/bong, you had to hold the smoke in so long that when you exhaled, no smoke would come out..... Or else you'd be skipped in the next time it goes around the circle. He even used to do "Roof hits" where he would inhale the smoke resting on the ceiling of his car. Basically, just because you smoke pot doesn't mean anything about whether or not you're going to become successful or not. YOU as a person make that happen; a drug that is statistically as addictive as Caffeine (@ 9% of users becoming clinically addicted), is not going to keep you from becoming successful.
Also, to add another example: Ted Turner, owner of CNN, smokes a joint every day. The guy is old as hell, and rich as hell.
My last example, is Abraham Lincoln. He has actually been quoted saying that one of his favorite pastimes was to sit on his rocking chair on his porch, and smoke "sweet hemp." Back then, Weed was known as "hemp." It was a long time before anyone called it "Marijuana"