if your best friend becomes drug addict......

Actually, when you have someone who is having a bad time, you should do all that you can to help them, without enabling them. If they are hungry, feed them food but dont give them money to buy it. If they are thirsty get them water but again dont hand them the money. Love them, be there with a shoulder to cry on and a strong back to pick them up when they fall, just don't let them continue to go the wrong way using your money.

First I will explore his feelings. What urged him to engaged himself to that habit. After i understand the cause I'll try to integrate it to reality. Now if he'll understand me too then problem is solve. I'll just have to follow on him every now and then to be sure he id on the right track. On the and If he doesn't understands me then as his best friend I will secretly turn over him to the local authorities. I am concern with him so it is but right to make him free from unnecessary things in this world.

u can pull him out. I have seen a live example.

I will try my best level to pull him out from that. Friend means share everything and support/help him in every situation. Otherwise it doesn't call friend. So i will do everything to pull him out of this if need i am ready to hurt him but only because i want to pull him out.