Some things are inherently disordered, such as homosexuality and pornography. But not plants. There is nothing inherently wrong with a plant. Now, some can kill you if you ingest them, some are nutritional, and others can be used medicinally. Cannabis is one such plant, which has great medicinal value. It also happens to be a favorite for those who like to take “recreational” drugs.
Now, I don’t believe that any natural plant should be made illegal. That does not mean that we should allow all uses of a plant. For example, if someone used a poisonous plant to murder, that person is guilty and should be charged and prosecuted for murder, but I don’t believe possession in itself should be illegal.
The problem with framing the question as “legalizing” cannabis (which is often how it is posited) is that it sound like we’re saying “Should the government give us permission to do this/should it say that it’s okay?” And I don’t see that as the proper relationship between the people and government at all. Government shouldn’t “give us permission”. Rather, we should be able to do anything (legally, though not necessary morally!) as long as we don’t harm another.
I don’t have time or the inclination to get into the details of “the war against drugs”, but I will say that it is a political sham and is very detrimental to society in many ways (violence, bigger government, unnecessary prison sentences, etc.), but gives the government greater power and profit (gov often profits from illegal drug trafficking).
I do not believe that people should be encouraged to use cannabis recreationally. I do believe it can be very harmful if improperly used (can create addiction, health problems, etc.) However, I do not believe the government ever had a right to make a plant illegal. That said, I don’t necessary think it should be sold at every drug store, and I believe there are responsible ways of selling it where it will do the least harm and the greatest good.
I believe that purposefully viewing pornography for is a sin under most conditions (I suppose one could exclude study purposes). The same goes for homosexual acts, abortion, etc, but I do not believe that cannabis use falls into the same category. I don’t believe it is automatically sinful, and so I don’t think it can be argued (for or against) the same way.
I hope this has helped you with the issue, even if you disagree with me. I think I know where you’re coming from. I too worry about irresponsible behavior with the drug, even if I don’t believe it should be illegal.
By the way, if they present to you the silly tax argument, let them know that tax monies won’t just suddenly appear from nothingness. They will be taken from other places where they would have been used in society.