Becoming addicted...?

ok, I've been smoking for a little less than a month... I started cause I've been under alot of stress, depression, and peer pressure lately... and it does help calm me down... but the weird thing is that I'm not addicted... I smoke 1 maybe 2 cigarettes a day... I do it for social reasons, and as a stress reliever... but a month is a long time, when do I become addicted? I don't want to become addicted, I just want to know so maybe I can avoid it... hope that all makes sense