Here's how it works.
Plants, are just the opposite of Mammals. We love fresh clean oxygen saturated air. Anything other than oxygen we take in is a by product that produces waste.
Plants being the opposite of oxygen loving mammals, love fresh, clean Carbon Dioxide, or Co2. Anything other than fresh air with a concentration of Co2 will produce a byproduct, not Oxygen. The only element the plant turns into Oxygen is Carbon, and in the form of CO2. They absorb the Carbon, leaving only the o2 for us to enjoy and live.
We don't like to breath smokey air (unless we're getting high), it isn't good for us, and it's not good for your plants. They would appreciate however, a Co2 Tank releasing at 2Liters per minute/ 3 times a day/ for 15 minute intervals. ALSO since mary jane is able to absorb nutrients and water from the leaves, they can also absorb Co2 from Carbonated Soda. They will love and appreciate you for it.
Bottom Line, Don't smoke around your plants, unless you want your kind buds to taste like Bong Water.
Peace,
Tenn