I myself despise smoking (and hey, I picked it back up after four years of quitting), but.. I quit again.
The fact that you ask yourself.. and you're looking for clarification that smoking is okay, kind of indicates that you do think its "horrible" to an extent.
Smoking is legal. Smoke if you please. It's all a matter of who YOU want to be, and the things YOU want to do. If you think smoking doesn't negatively reflect your goals and character, then go for it.
I quit, because it disgusts me. I felt like a gross person. I had to depend on a stinky cigarette.. when really, I wanted to take pride in my health. So, it's up to you. Your decision. Only you can decide for yourself if it's horrible or now...