There's no original reference material here, so it would be hard to say if it is censorship or not.
Also, I don't think that a manhua like this needs a PG rating. When One Piece was dubbed into English they wanted it to be PG and television friendly, I don't believe there are such restrictions or rating systems on manhua.
Excessive blood and gore are indeed required to be censored by the government, but I don't see why cigarettes would be.
god dammn, why does the author feel like it's necessary to give the boi so much shounen garbage tropes, this is over the roof already. Well, i'll keep reading, thank you Mr. Translator.