How to talk to my mother about smoking outside?

I don't know your ages but you and your brothers should seriously consider moving out. Do you have any relatives you could live with? What about sitting down with your parents and ask them to rent an apartment, along with food and utilites for you and the three younger brothers. Explain to them that their smoking is endangering your lives and since they won't smoke outside or in one designated area you thought that a good compromise would be for them to put you guys into a healthier home. Also let them know that you'd give some thought to turning them in to Child Protective Services, but you'd rather not have them jailed for child endangerment. If you do this last part, you need to mean it. Saddly, your parents are addicts and as such will do almost anything to protect their addiction. I hope you can get through to them. best wishes