Young smoker & reasons?

Im 14 and i smoke, yes i know its bad so dont start saying quit and stuff like that, my friend doesnt smoke but she likes to light my tab (cig) My brother knows,boyfriend & my friends my mum and dad dont. But know doubt they will find out soon. The question here is my brother,mum & dad smoke so if they ask is a good reason because 2nd hand smoking is worse than 1st hand? plus its stress related mainly for me.