sure its not good for you, but nothing is 100% good for you, sure you will get cancer if you use it over an extended period of time, but most anything these days will give you cancer. plus weed isnt a toxic waste dump
But cigarettes are addictive two and yet people waste their worthless money on that two
It seems that you haven't taken to account all the other drugs that are legal
Smoking is never safe two but its kinda better then smoking cigarettes or drinking alcohol