If you're smoking because you're stressed, you might want to look into other, healthier ways of letting out that stress because depending on a substance can lead to addiction. While I haven't seen any solid proof that weed kills brain cells or anything like that, I know that addiction is a silent predator and if you rely heavily, it will take over your life. No one should ever judge you for making your own life choices as long as you're safe and happy, and it's healthy for you. Addiction isn't healthy. Smoking weed isn't bad persay, but you should be smart and conscious about and of it.
Be safe, and I hope you find a way to relieve your stress.