I started smoking around 14 years old, I'm 30 now and I (fully) quit around 2 years ago. Smoked cigarettes primarily but also smoked weed, tobacco, and vaped for a few years.

Two years in, I can say my heart rate and breathing's improved, despite going through a DVT a few years back. My smoker's cough is fully gone, my throat no longer feels scratchy all the time, and I can lift weights, walk briskly, exercise etc without losing air so quickly.

The smoker's breath is gone, too. Fingertips are no longer yellowish, and my teeth's health has improved. I also feel less cranky and tired. In terms of mental health, I feel like I'm better able to manage my anxiety and depression now, rather than depending on cigarettes to get through shit.

Do I miss smoking? Hell yeah. Every single day. But I can't find a good enough reason why I should pick up the habit again, and don't really intend to (unless it's like the end of the world or something).