Yea you don't know what you're talking about.
Weed smoke lingers for a small amount of time, like yea the same day they smoked you would smell the weed on them or in their cars. Maybe the next day too if their car was closed. Not long term.
Yet if you were to buy a (doesn't matter) playstation from someone who smokes ciggerettes in their house, frequently, then you could see that playstation stained from the gray the playstation had, plus it would literally have a cigarette stench even years later. Meanwhile if you bought a playstation from a weed smoker who constantly smoked indoors you would never even know it. Cigarette smoke attaches itself to anything and everything and never lets go. Why do you think people list shit on eBay and other places as "from a non-smoker home".
As to the OP who is dead on BTW, its because of all the additives in cigarettes as someone else already said.