I quit cigarettes, I never felt any better, but felt a huge sense of accomplishment. The weight gain, is another story.
I had quit smoking several times for short periods, the longest was 4 yrs. and I had gained weight but then exercised it off. This round,isn't as successful.
But it will be 2 yrs in July since I quit this time, so that's a good thing. My dad died from emphysema, and mom has COPD,vascular disease, and so many of other diseases, obviously the 2 mentioned have been behind mini srokes, and lack of circulation to her feet, an also being diabetic, she risks amputations(s). She's had procedures to help prevent some things but it still is worsening. I had her quit in 2003, she, like I, still miss smoking, but we miss dad much more, and do not want to suffer like him and also keep honor by doing whar he asked, "please stop smoking" before it's too late.
Sorry for digressing, but consider quitting smoking first, caffeine is not harmful as some people think, they have found some benefits too.
Did y'all know smoking's nicotine interfers with sleep, it is a stimulant, so anyone with insomnia, they recommend not having a smoke close to bedtime.
I'd choose to quit the smokes first.
Lots of luck with this challenge.

((((((((((( gg ))))))))))))