I honoustly dont know what the effects of creatine and weed put together have.
but weed and smoking in itself is not the best of things in the world
talk to them, convince them you care about them and they should stop. Tell them the health risks involved.
Its hard but give it a shot, you never know.
good luck
Well, the weed and cigarettes will catch up with him eventually, I doubt there's any type of drug interaction between the creatine, nicoteen, or THC. Tell him to stop wasting his money.:angry: