I can imagine that having any of these marijuana tattoos around your neck is much like wearing a stop and search sign (unless you're in Amsterdam). I can also imagine it is also one of the tattoo themes that would potentially get you hassled when you're seeking new employment.
That said, marijuana plants have got to belong to the most famous icons in the world, instantly recognizable by all. A cultural icon it is.
Moreover, there is no doubt questioning the level of art in the whole back marijuana tattoo. It would be fair to say it blows my mind, and most probably that of the tattoo ‘owner’ too.