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 However, nonspecialists (including many doctors) still tend to use an older perspective, now seen as outdated by experts.
An addicted cannabis user will continue to use the drug despite effects like these. It is common for a heavy smoker to stop caring about the damage and just focus on staying stoned. This is what is called âaddiction.â It applies just as much to marijuana as to crack or meth or pain pills. Â®. Be Drug Free.