I am 14, how and when do I tell my parents smoke?

Sup yahoo dudes, about 6 months ago I started smoking I'm hooked on the ****. Im so desprate at times a want to smoke at the house but I don't know what the reaction is gonna be. Both my parents smoke and haven't yet even thought i smoke and all I know is they would defenetly want to kick me out of the house. What should I do!?