Nicotine is a neurotoxin and has been used as an insecticide historically... so I have no doubt it could kill your fish.
I couldn't see smoking being too detrimental, although be aware that if you have an air pump and smoke goes through it, it'll be heading into your water too. Although you'd probably have to hotbox your room and blow into the pump to kill your fish...
I couldn't see smoking being too detrimental, although be aware that if you have an air pump and smoke goes through it, it'll be heading into your water too. Although you'd probably have to hotbox your room and blow into the pump to kill your fish...