Praise the Lord.
I will say a few things on the matter:
The first is a response to the common argument that since there is a law against it, we have the duty of Christians to follow it. There is indeed a passage in the bible that states this. My concern about this is that the law against marijuana was brought forth from a racist heart. Here are a couple quotes by Harry J Ainslinger, the man responsible for marijuana prohibition:
"There are 100,000 total marijuana smokers in the U.S., and most are Negroes, Hispanics, Filipinos and entertainers. Their Satanic music, jazz and swing result from marijuana use. This marijuana causes white women to seek sexual relations with Negroes, entertainers and any others."
“Reefer makes darkies think they're as good as white men."
If you want to strictly observe a law that was based on these feelings, by all means go ahead. I refuse to be so harsh. Because racism is not of God. And if people were aware of these quotes and who said it, they would strongly oppose the law anyway. I believe that truth is a far greater component of your faith in Jesus Christ, than laws made by man. In recent years there have been laws made in some states (esp. Florida) that prohibit serving food to the homeless in a public place.
If you thought all law is from God, here is the roadblock: you cannot agree with the law of not feeding the homeless - this is one of the righteous works mentioned over and over in the Bible. It is a law against the works of the Lord.
It is written that 'by their fruits you shall known them'. Identify if the person is bringing ideas and arguments forth that are positive, good things of love from the Lord- or is it full of condemnation and the spirit of judgment?. Especially for the ones who are speaking against marijuana, you cannot bring wisdom from Heaven unless it is full of mercy, in the name of Jesus Christ. (James 3:17)
The second observation is whether or not the experience of being high on marijuana itself is a sin.
The bible says 'and sin, when it is full-grown, gives birth to death.' James 1:15
There are statistics that show hundreds of thousands of people die each year from the direct experience of smoking cigarettes, or drinking alcohol.
I have never read a study that even suggests that smoking marijuana can lead to death (through the direct experience).
If it does not lead to death through direct experience, then it is clear that the direct experience is not a sin maturing unto death.
However, what about temptations that come through from the experience? This is a very worthy question. Maybe consider these the thorns and thistles. The aware Christian should be on guard against any lustful temptations trying to overcome you while you are high. I would say that those urges can come to you quite quickly in the state, but by the power and authority in the name of Jesus Christ, you can overcome. Speak against any spirit trying to do you harm through sexual influence, in the name of the Lord. The other fleshy concern with marijuana is the desire to over-eat (gluttony). I think if a person catches themselves in a situation where they feel like they are stuffing their face, in the very least, DO NOT FORGET TO GIVE THE LORD THANKS. I have had problems in my life with eating sometimes, and sleep, so I know what it's like. I do strongly remind everyone though that your healing and deliverance is through the Lord Jesus Christ alone. You don't Need to use it for healing, or anything else for that matter, because God creates out of Eternal Life (the miracle of feeding the people, and taking back more in baskets than was given out - or when he told the disciples on the boat to beware of the teachings of the pharisees.. they had forgotten to take bread, but more importantly they had seem to forgotten that The Lord is the Creator. What would the disciples be in need of with Jesus around? Only Him.)
I think you should be honest with yourself, and allow yourself to build on a good foundation. Do you do it because you like the experience? It is okay to be honest. If you say you are doing it for the healing, you could be robbing yourself of the opportunity to Praise the Lord for His direct healing. Or, you may say, God has provided this plant for my healing. I will certainly not argue with you if you say that, because nothing is impossible through the Lord. And because healing is a good thing. Just remember, and I say this through my own testimony, that the Lord's healing is the ultimate healing. Prayers of deliverance are truly more effective, and truly more important.
Lastly I leave you with this piece of scripture for encouragement:
1 Timothy 4:4 For everything God created is good, and nothing is to be rejected if it is received with thanksgiving,
p.s. if any of you smoke weed and wake up with a dreadful feeling in your stomach, that is a sign that the enemy is trying to harm you through your dreams. It is written Matthew 13:25 But while men slept, his enemy came and sowed tares among the wheat and went his way.
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For your deliverance, in the name of Jesus Christ.
May the Lord bless you and keep you.