Two Bible verses come to mind, first
1 Corinthians 6:19
What? know ye not that your body is the temple of the Holy Ghost
which is in you, which ye have of God, and ye are not your own?
and second
Ephesians 5:18
And be not drunk with wine, wherein is excess; but be filled with the Spirit;
Corinthians 6:19 reminds us that as Christians we should be mindful the God lives in us through the Holy Spirit. Our body
is His temple. So ask yourself, does God want His temple smelling like weed? Yes? No? Ask God and He will answer.
Ephesians reminds us that we should always be in control and of sober mind. Though the verse relates to alcohol, it can be used
to talk about any drug or substance that takes away control from the mind. I have not smoked but I hear that it effects the will power and can lead to hallucination. I do work with many teens that do smoke and I can attest that their motivation is zapped terribly. If God has great works for us to do, will it be hindered my smoking pot because we have lost motivation or will it be made easier?
I think the answer to those two question should give one a pretty good idea as to what the answer is.
Personally speaking I interpret the scriptures to lead us in the way of wisdom which means don't smoke weed.
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