I agree with the comments saying don't smoke tobacco, that's the worst habit I ever picked up. I haven't smoked in over 6 months and I can breathe a lot better and I'm not nearly as stressed out as I was when I was smoking those damn things. Nicotine acts as an imposter to what you are really short on in your brain which is dopamine, that's why people with Attention Deficit are more prone to addiction. Especially by any substance or action that stimulates dopamine and/or endorphins. The dopamine in the brains of long-term cannabis users is lower than non-users, which leads many cannabis users to experience a lack of motivation.

With Attention Deficit we already have low dopamine levels, so if you keep smoking it all the time, eventually you will experience a lack of motivation and maybe even psychosis like I have from it. Which I assure you is an unpleasant experience, unwanted voices in your head, feeling as though you are being watched, and an extreme panic reaction that makes you question your own sanity. Long-term cannabis use may blunt the brain's motivation system

It is also my opinion that cannabis is what caused my dissociative symptoms, but I've used other hallucinogens before so it could've been those. It could help some people with certain medical conditions, such as cancer, AIDS and what not. But there are already FDA approved versions of it that are far more safe than smoked cannabis purchased from a local street dealer. That stuff is sprayed with more pesticides than you think, same with tobacco. Cannabis also makes it difficult to grow muscles, because it boosts estrogen in the body, in a male body, more estrogen means less testosterone. So you will be more cranky and irritable. Far from "calming you down" in the long run it will just rile you up more.