My best friend is going through the same thing you are. He did smoke a lot of pot in his time, but all of a sudden he quit because he thought it was gonna kill him. Since then, he's become an anti-weed advocate, but we are still friends. The reason he had to quit was not because the ganj was affecting him adversely, but all the propaganda and BS in the media made him scared. He got scared of something harmless, and his mind tricked him into believing that the weed smoking was ruining his life. Beware of misinformation and how much of it you are led to believe.