In our families case, weed was most certainly a gateway drug and it is still being used destructively in our family as a whole. I often wonder why my brother in law never took it past weed, while my brothers took it all the way to heroin and I can only conclude that it must have had something to do with the difference in schools / friends and neighborhoods that we grew up in..........................................
While weed can be a gateway drug even in the upper class neighborhoods, I have a feeling that it's more prominent in the lower class neighborhoods.
I can appreciate and understand that. Often though I think we can look at things and think the source of something is one thing, when in fact it may be much bigger.
This is one of those funny and sad topics that hits everyone differently as does substance abuse.
People who have fought drug addiction, or who have seen it destroy their love ones, are rightly sensitive to this subject. While those who have seemed to experimented with it and don't see the harm others experience seem to be able to make light of it. Still others who've never used drugs (including alcohol) often look for information and end up with no solid answers.
I think the opening question; "Is smoking marijuana a sin?" is not as open ended as it may appear, and we might as well ask;
Is substance abuse for the pleasure of altering ones mood a sin? because that's what we are really talking about. Whether is celebrating something or escaping the realities of life one finds difficult or impossible to deal with, either way one is leaning on something for the effect.
When I think of "sin NATURE" The very word "nature", to me is all-encompassing, especially when it comes to any drug use, because there are NO clear borders, and no one can come to a reasonable agreement to say where something starts and stops as sin. Oh, we all have an opinion, but that seems to be tied to our own individual schema, and that does not address the word "nature" in the biblical term of "sin nature".
We should agree however, that when the bible refers to man as having a sin nature and we see people holding wide stances on what is sin and what is not.....God must be laughing at us!
Because it must look like dogs playing poker. Dogs don't play poker!
And man is not; NOT sinful over here and sinful over here.
But here is how I'd answer the question. The answer to whether something is sinful or not is to compare it to the greater good, and lean to the greater good.
The greater good is God, but for us to lean to the greater good for some might mean not having that drink or using that drug today. It might also mean not imprisoning someone as a society for using a natural drug, or it might mean locking someone away for providing it on a large scale for profit.
I'm a beer and wine drinker, and I've smoked pot when I was younger. I can honestly say I'm not drunk and I don't smoke pot these days, but I can not say I'm not a sinner. I can list all the good and bad things I do or have done, but it will not change my nature.
I can say I don't want to be a sinner, and I can say I hate sin. I hate my sin, your sin, his sin, her sin, their sin, but that dose not change anything, and in the end I've no choice but to lean to the greater good, and I do this because I am a sinner, and I need the greater good to love the sinner I am and to help me love the sinner this world is, because I can't do it. Why? Because I'm a sinner. It is my nature, and the only escape of that nature is to lay that fact at the foot of the greater good than me.
It does not matter if someone is a pillar of society voted the best, more moral person in the world, or a hopeless drug addict on the street; God wants a relationship with both of them today. But to do that, both of them need to lean to the greater good, because both of them are sinners, and neither of them have any more or less of a list to describe their sinfulness.
Is smoking pot a sin? yes
My only intent here was to draw out some honest conversations on sin, and drug use is always a good topic to do this. The OP brought up a great question that we can apply to a lot of things, and that we can think differently on depending on the little boxes we all build around these topics.
Sure the bible says a lot about sin. It get's down to the nitty gritty and we can say; well I don't see it listed here so it must be OK. But the bible also make these all-encompassing statements about sin that we can not ignore.
Galatians 5:17
New International Version (NIV)
17 For the flesh desires what is contrary to the Spirit, and the Spirit what is contrary to the flesh. They are in conflict with each other, so that you are not to do whatever you want.
Romans 3:23
New International Version (NIV)
23 for all have sinned and fall short of the glory of God,
Romans 3:9
New International Version (NIV)
No One Is Righteous
9 What shall we conclude then? Do we have any advantage? Not at all! For we have already made the charge that Jews and Gentiles alike are all under the power of sin.
I don't want to derail this, and many may see these passages in other ways, but they still point to the very nature of all men.