I put your question into Google and got this:
"Once smoking was common among the chess players. A lot of World Champions were smoking: Alekhine, Tal, Spassky, Korchnoi. Now there's a quite strange situation - from a hundred best players perhaps only 5 people are smoking."
Alexander Grischuk
http://chess-news.ru/en/node/7823
As I know old masters, even world champions smoked. Tal and Spassky comes to mind, Lasker too. Kramnik stopped smoking in 2000.
I'm curious is there any of today's super GMs smoke?