They actually refer to themselves in their publicity as the psyhcotic magicians...

cigarette smoker has an 8% lifetime chance of dying from lung cancer but the USWM nonsmoker also has a 1% chance of dying from lung cancer
Which means as a smoker you have an eightfold increase in you chance of getting lung cancer... which results in how many years on average shorter lifespan and an associated reduction in quality of life due to shortness of breath?

Smoking cause a 700% increase of lung cancer in smokers. Cancer is a bit like russian roulette, some people will get killed with a minimal amount of exposure others will dodge the bullet. However there is a link between increase in usage and increase in the rate of cancer... a cause and effect.

So smoking does cause lung cancer.