Studies after the recent discovery of the endocannabonoid system god created us with suggests when boosted by consuming Cannabis we become healthier..so it has the opposite effect of a toxin...Most pharmaceutical drugs are way way more toxic and addictive, aspirin has caused more deaths than Cannabis, it can be argued Cannabis has not caused one single death in all recorded history..
I know there is an argument that it causes people to feel different, but so does Caffine though more subtle..My understanding from the Koran is if it covers the mind its warned to stay away from, but that would make most medicine haram, and Cannabis opens the mind , its pshyco active..
Not saying its good to get stoned all day every day just for fun, but its a much much safer and cheaper natural herbal remedy for many many ailments...I dont thing God made a mistake when he created this plant..If anything is a sin its denying suffering people safe effective medicine for the sake of corporate profit, imho..