I should just keep my mouth shut...but I'm not gonna. The quote about X number of lung cancer is caused by second hand smoke. How do they know? Lung cancer occurs in people who don't smoke and aren't around smoke too. How do they know that second hand smoke actually causes a specific case of lung cancer. I mean I'm sure it would if you sat right next to someone who was smoking and breathed in as much of the smoke as you could 20 times a day every day for like 40 years... but Think about it. Just an off the cuff example: People smoke 2 packs a day every day for 40 years before they get lung cancer. They probably inhale 50-60% of the smoke from each cigarrette. Now someone sitting next to a smoker would probably inhale something like .1% of the smoke from that cigarrette. If you look at how much smokers smoke and how much non smokers smoke second hand, it's a little ridiculous to say it causes lung cancer under normal circumstances, I mean I'm sure it's not helpful but does it actually cause it. Now back to fish... How much second hand smoke actually gets in the water? Compare that to how much is inhaled by the smoker. Then consider how much is removed by carbon waterchanges etc... Considering the size difference of the organisms involved I still don't think it's likely that second hand smoke will affect the fish under normal circumstances because the percentage that gets absorbed into the water is also diffused throughout the water. I'd like to have some hard numbers so I could be sure but logic tells me that it shouldn't be a serious issue. Maybe if the fish tank is in a bar where 10 people are smoking constantly and a thick cloud is always hanging in the air.
So to answer your question it's a good excuse to try to trick your bf into quitting smoking, but no 4 cigarrettes in a living room a day shouldn't hurt your fish. If that's what you really want then there are lot's of other ways you can convince him...for instance tell him that your sick of tasting it when you kiss him and that you don't like the smell, and that you don't feel like carting around his oxygen tank for him and watching him gasp for his final breath...Tell him the walls are turning yellow and so are his teeth. Show him pictures of smokers lungs and of premature babies, show him how much $$$$$$$$$ he's throwing away every day so he can kill himself. Make him think about your children watching him smoke a cigarrette through a hole in his throat. Tobacco is bad.
BTW I am a smoker. i started when I was six or seven years old. I smoked maybe a cigarrette a month for 2 years but then it became 1 a week then 1 a day then a half pack a day then a pack a day. Now I smoke around 5 cigarrettes a day and I want to quit. I'm 20 years old so I've been smoking for around 12 years. I can feel my lungs dieing. I am sure that smoking as well as second hand smoke has a much greater effect on a child than it does on an adult.
I can see why general chat was closed down now...I shoulda just kept my mouth shut...but I didn't.