can chocolates be substitute for nicotine?

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My boyfriend stopped smoking and he said he's very grateful to chocolates. He told me that when he felt like smoking he would buy chocolate candies and consume it instead of lighting a stick. He's convincing me to try it to get rif of my smoking habits but I am not all convinced because chocolates are sweet and eating it whenever i feel like smoking could hike up my sugar level which is very possible because we have a family history of diabetes. Please help.