Where do you see the group of people who are libertarian on the issue? In other words, people who think that the premise that drugs are immoral is flawed, and they should be regulated for safety, but society does not need to discourage their use and certainly does not need to ban them.
I see those people as on the moderately far left, at least in the United States. There are plenty of people on the moderately far left who are not libertarian in the vast majority of positions, but who would agree in the case of drugs.