In the article, the chart from a study is shared. You can see there, that marihuana is on the same level as coffeine. So there is a potential to dependence, although it is definitely not so high as in the case of nicotine or alcohol. I think that after years of using it, you should be at least somehow addicted. But I do not know. Maybe if you do not use it so often, you could be OK. Also... the potential to dependence is individual and some people could be "resistant" to these "light drugs". And also the article says that medicine and drug are the same thing.