Hi, Just A Week Ago I Went Out The Hospital

Hi, just a week ago I went out the hospital from spontaneous pneumothorax, i just stayed 3 days in the hospital, I'm smoking tobacco since 11 years old and marijuana the last 3 years daily around 7gramms every 2-3 days.. I'm tall and kind of skinny... If I put on weight can I smoke again? I fell really depressed since I haven't smoke nothing for a week and I really like weed as well.. How about if I take some mass gainers.. I know my question is not healthy, but what can I do? At least until I'm healed so I can start gym and quit smoking at all?