Welcome!
Well man, dont be so harsh on yourself, thats a start, since you just turned 16 you still have a long time to develop it, this is just the beginning.
Im also taking complex B vitamins and calcium, but I didnt notice any difference yet, maybe just in nails growing faster.
All you can do now is wait.
About the smoking marijuana thing...im not able to asnwer that, but I´d really suggest you to stop using it, even with a friend, its bad for your health as you already know