A saying goes this way "you are defined by the decision you made", which means if you decide to take drugs and take it as a habit God will not stop you Why? Because it is the decision you made and as such caused by lack of knowledge of what you intake.
I will share a short story, there is this fellow who was never into drugs before but as a result of peer pressure or you can call it influence lead him into. This fellow has no isues with lungs and liver but he started taking drugs(cocaine and others) lead to issue of lungs that is coughing. According to him when he went for test at the hospital, the result shows that his lungs has been 70% damaged. You see the effect of intake of drugs and where it has gotten him to.
To overcome drug addiction one has a role to play which is obeying God's word, putting His word into action and putting his faith as well knowing that he can be saved by God and knowing that drug addiction is not in line or according to His will and knowing that his body is the temple of God, by so doing He (God) can help the fellow to overcome such addiction
Thank you for reading and remain bless.