Well first off it does kill brain cells and your brain doesnt fully develop until youre 25. While weed doesnt have the harsh chemicals cigarettes do, it is still bad for you to inhale smoke. Any kind of smoke. And youre really young to be smoking. You have your whole life ahead of you and you dont want to have to regret smoking when you have a central line stuck in your arm going to the tip of your heart feeding you antibiotics for weeks bc you had lung surgery bc of a mass on it. There is no for sure evidence that smoking causes cancer but it does contribute to it and make it more likely. And it ages you faster in a bad way. People who started smoking at your age and never quit...no offense but it takes a toll and they look so ugly and wrinkled and their teeth are disgusting.