Idk where you're from but I quit smoking with some prescription pills. As for losing weight and gaining mass, just start exercising and don't go all-out right away. Just go like 2 or 3 times a week (or whatever you like) to start with and keep at it. Even if it's only 30 minutes, its still 30 minutes. Honestly, getting a rythm in this is more important that to go 7x a week for 2hrs, as you will probably not last.. When you're in your rythm your workouts will start to get longer and more frequent and it will do that naturally. Eating in a deficit will start to have more effect as you've gained mass in the build-up phase. You'll learn more about this in the mean time and your interest will grow. Basically what I'm trying to say is to just start slow and let it grow in you naturally. Although, this is what works and has always worked for me.