For a function of two variables z=f(x,y), the gradient is the two-dimensional vector <f_x(x,y),f_y(x,y)>. This definition generalizes in a natural way to functions of more than three variables. For the function z=f(x,y)=4x^2+y^2.
By this definition, about 10% of people who smoke marijuana become addicted to it. (More on Time.com: PHOTOS â Cannabis Conventions). However, nonspecialists (including many doctors) still tend to use an older perspective, now seen as outdated by experts.
I feel a lot better knowing that marijuana is an addiction and that your body becomes dependent on the thc. 6-12-10: I tested positive for THC after 17 days(roughly) I was a heavy smoker, all day long every couple hours I had a good 2 bowls worth of pot(pretty high grade pot as well).