Nicotine as a functional drug?

Hello,

I quit smoking almost two months ago. Withdrawal was problem-free, and I no longer have any cravings. However, I've been very irritable ever since, and it's always helped me calm down, especially with my ADHD. Yesterday I tried it again during a relaxing evening. I was more awake, in a much better mood, and felt really good (which hasn't been the case for any reason over the past two months). I don't know why, but nicotine has filled a gap in my life to compensate for problems, and I don't know what to do about it without resorting to nicotine again. I've been thinking about switching to snus to achieve the best effect with the least risk.

Thanks for answers