Nicotine gum or toothpicks can be used for focus enhancement, though sensitivity and side effects vary.

“However, some people will chew Nicorette or other nicotine type gums. I've never done that, but I have friends who actually rely on that. These are typically former smokers that are trying not to smoke, but still want to get some of the focus enhancement that they experience from nicotine. Some people are very sensitive to nicotine, and this is important. Some people are very sensitive to ingested nicotine. So nowadays there are nicotine-dipped toothpicks, there of course, is nicotine gum and other sources of nicotine.”