Smoke will clog the stomata so yes smoking around your plants is bad.

The white mold on the dirt is probably toxic salt build up, watch for nutrient lockout. It's a good bet there is no problem and you can just turn the soil and the next time you water it will dissolve back in to the system.
Zandor Reviewed by Zandor on . questions from a new grower does cigarette smoke kill the plant. Also, it looks like there is white mold on the dirt itself. And when can i determine sex, they are about 6-7 inches. Rating: 5