Why did Al Pacino drastically change his voice from clean to rasping?

As far as I know, an actor voice is something that does not change much, but I realized that Al Pacino's voice has changed a lot in a short amount of time.
In The Godfather, part II (1974) he has a clean voice (extract here).
However, in Glengarry Glen Ross (1992) or Heat (1995) he has a completely different voice. It doesn't even look like the same person.
Best Answer
20 years is not a short amount of time.
Regardless, Pacino's voice has changed over the years, which is natural. In addition, his acting style has changed signficantly from the early Godfather days to more "shouty" characters...at least that is what he is known for.
However, he has been a smoker for many years.
Stopped a two-pack-a-day smoking habit to protect his voice (1994). In the mid-1980s, he had been smoking four packs of cigarettes a day. He now only occasionally smokes herbal cigarettes.
It seems clear that Pacino was well aware that his voice was under threat and took steps to amend his lifestyle (at least moderately) to protect it.
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Why has Al Pacino voice changed?
Sure, we all get older and our voices change, but this is massive! What happened? The obvious answer is that he reacted to the success of Scent of a Woman ('92), and started in on his yell-acting phase because that's what got him an Oscar.What accent does Al Pacino have?
What about Al Pacino? I can't recall which films he's spoken Italian in before, but I remember never being too impressed with Al Pacino's Italian. I think he did his homework for this one, because his accented Italian was pretty good. He correctly pronounced th- sounds the way Italians do repeatedly.What role did Al Pacino turn down?
Pacino has been very open about missing out on many film roles over the years. Most notably, the star also revealed in a past interview that he turned down the part of John McClane in Die Hard. The famous cop eventually went to Bruce Willis.Al Pacino's Voice Over the Years | The Godfather to Misconduct
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