What is the ruling on my fasting after I broke my fast in Ramadan for three days: a day in which I intentionally ejaculated semen out of lust by watching a pornographic film, a day in which I consumed drugs via smoking, and a day in which I injected drugs intravenously?

You have wronged yourself by intentionally breaking your fast in Ramadan, which is one of the major sins. Your fast was invalidated on the day you masturbated and on the day you orally consumed the drug. Administering the drug rectally does not invalidate the fast, but it is a falsehood. You must repent to Allah and make up the two days you broke your fast. Expiation is not required of you except for breaking the fast through sexual intercourse.