Cigarette Smoke Effects On Plants?

[Beverly Erlebacher]

In article <01bd2ccb$df4a1780$1f621e82 at oemcomputer>,
Ken Wolfe <wolfe at intellistar.net> wrote:
>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.

Could be the tars coating the leaves and inhibiting gas exchange, and/or
coating the glass and reducing incoming light.