Cigarette Smoke Effects On Plants?

[Ken Wolfe]

When I was in high school my science project was to see the effects of cigs
on plant growth.  The plants were kept in a terrarium type structure.  One
terrarium had cig smoke blown in twice a day the other had just regular
air.  Initially the plants receiving the tobacco smoke grew faster. 
However, after a few weeks they stopped growing and the others grew larger
and seemingly healthier.

No hypothesis as to why just empirical evidence that concentrated smoke
damaged the plants.

Ken