Weed isn't harmless. For example, it can probably lead to long-term brain damage. It is also toxic for the lungs, although less so than tobacco, which is usually consumed in greater quantities.
Sure, but that’s not different from other things reserved to adults in life. And we don’t label those consumers as victims… it’s stretching the definition of victim to a point where it loses its value
Considering that there are a) many drugs that are substantially more dangerous than marijuana and that b) addiction does create users which are not in full control of their actions anymore, the term "drug victim" does make sense.