no, you can't compare cannabis addiction to heroin or crack or meth as cannabis addiction is purely psychological whilst the others are both psychologically and physically addictive. however it is still a serious problem, just not nearly as bad as any of those.
and to those saying use your mind, saying "use your mental power" or whatever is just as applicable to a physical addiction, you don't use your physicality to overcome a physical addiction, you use mental will to overcome any addiction. if anything it would be harder as you are combating a mental addiction with a mentality that is inherently flawed due to said mental addiction, whereas with physical addiction it is a lot more clear cut and a simple mind over matter exercise. however i do not know of any drug that is purely physically addictive with no mental component to make the comparison with.
You are all idiots, in my humble opinion. Think for your fucking selves. Congratulations on "functioning well in society" and losing your individuality. Herb is a plant. It evolved to create THC to stop birds from eating it. It is not a drug. It does not think. Your body produces THC in small amounts. Herb just grows. Thats all. Whether or not you choose to smoke it does not quite have the profound effects you were spoon fed to believe.