First off ... let me say that I am all for the total legalization of domestically produced marijuana in the United States, with minimal regulation (age 21 & over, no additives), and with only normal State/local sales tax imposed.
I am, in fact, an active member of Law Enforcement Against Prohibition (LEAP) and National Organization for Reform of Marijuana Laws (NORML.) Further, before my employment as an LEO and since my retirement I have enjoyed my domestically produced herb whenever it has become available to me.
However ... looking at the lists of Obama commutations of supposed "non-violent drug offenders" (this isn't the first go-round, btw) I find the vast majority are in for distribution and/or production of meth & cocaine. By and large, they are not simple pot-heads, weekend pot-smokers, convicted of simple possession, nor are there many domestic pot farmers on the list (I've only seen one.) Most of these people were distributing cartel imported cocaine and large quantities of cartel marijuana .... or producing/distributing methamphetamine here in the USA. These are Federal convictions ... the Feds don't often lock somebody up for simple possession. They were part of criminal networks that extend all the way back to some very bad people in Mexico, Columbia, and elsewhere. I do not have a lot of sympathy for them except where their sentences exceed 10 years prison time. They were in it for the money and distributing extremely harmful addictive drugs into our communities. Many of them, frankly, are not very nice people. However, twenty-year, forty-year, or life sentences, absent a history of violence are probably excessive in most cases IMO ... even for coke & meth. Absent a violent history, 10 years should be sufficient.
I'd really like to see the case-by-case details of who's getting their sentences commuted; the specifics of the crimes for which they are incarcerated; and their prior criminal histories before their most recent conviction.