Excessive use of anything is bad. The claim that is often made on these threads is that it is somehow immoral to use pot in any quantity, presumably because not only did Congress decide so, they also had the authority and competence to get it right (even if the GOP at the time disagreed)
Libertarians are right with Liberal Democrats regarding the moral issues.
Many claim they would not use pot themselves, but would gladly turn a head as you proceed with that vice so they can achieve theirs.
Anarchy would be a Libertarians playground. Freedom to the extreem.