What is the ruling on a young man breaking his fast in Ramadan due to feeling loneliness and depression and his desire to smoke and drink coffee?

What you did is a great sin, and it is one of the major sins, because you deliberately broke your fast in Ramadan during the day without a legitimate Shari excuse. You must make up for these days. You are not required to offer expiation (kaffarah) unless the breaking of the fast was through intercourse, according to the preponderant opinion. You must also perform sincere repentance (tawbah nasuh).