One problem at a time!
besides...Smoking is already illegal on Venus.
Wouldn't it be interesting though to see if we could create an experiment that would in some way completely alter the atmosphere of an entire planet?
I know, I know...We are supposedl doing just that on Earth...
But lets do it to other planets where the results have less impact on us.
Maybe in so doing, we can learn more about our own planet, and what our true capabilities and limitations are.