DaasYochid-Smoking is terrible,even Rav Moshe tz”l who permitted it said it is better not to do it. Also see here, an article which tons of Rabbonim approved of, saying smoking is assur gamur:
http://www.rabbis.org/pdfs/Prohibition_Smoking.pdf
(Mods, please let this link go through, it is from many prominent Rabbis who prohibit smoking. If you can’t post the link, then please post my post without the link)
The article discusses Rav Moshe tz”l’s view.