Do not smoke anything around your plants!!! To put it simple there are kind of like little pours on your plant that help it to retain and release water, h2o and other things, when you smoke they close up and it is kind of like suffocating the plant. Also, the Mosaic tobacco virus can be transferred to these plants real quick, people can pass it to their plants just by touching the plants after smoking. People probably give it to their plants and don't even know it.
Adieu