Caffeine has some benefits, but some scientists feel there are most definite negatives, and we don't know all of the negatives yet. At OCD-Free, which talks about alternative treatments for OCD, it tells you caffeine "tears down the myelin sheathing and pulls out Thiamin (B-1) needed by the nervous system," and, "over stimulates [sic] the Adrenals." (Keep in mind, I'm not stating this as medical fact, and I don't know if this is proven in western medicine, but I'm pointing out it's seen as harmful in this alternative treatment.)

Additionally, some feel it worsens anxiety and causes sleep problems. I think that's true, because caffeine is a stimulant.

That said, I still believe nicotine is worse, and harder to quit. My parents both did it. I wish you the best of luck.