great question...

it is actually bad to smoke around your plants... there are studies on this subject matter...

on a side note... if you are growing hydro or aero and you use air stones... smoking around your plants will pump the smole into the plants water supply... this is extremely bad.. you can actually see the tar in the air lines...

it can adversly effect the PH of your reservoir...

especially if you use a sulfur burner....

iloveyou