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 However, nonspecialists (including many doctors) still tend to use an older perspective, now seen as outdated by experts.
Yes, marijuana can be addictive. Someone who regularly uses marijuana may continue to use it despite negative consequences in their life. Approximately 10 percent of users may develop what is called a marijuana use disorderâproblems with their health, school, friendships, family or other conflicts in their life.