Personally, I would love to take you up on that little bit of speculation, but DT has always said he has never drank alcohol or smoked in his life.
A quick search gave me this:
Donald Trump has publicly stated that he has never consumed alcohol. His decision to abstain from alcohol was influenced by the tragic death of his older brother, Fred Trump Jr., who struggled with alcoholism. Trump has often mentioned that he wanted to avoid the same fate as his brother and has never had a drink in his life.
As for smoking cigars, Trump has also claimed that he has never smoked. Despite the existence of cigars branded with his name, such as the "Trump Presidential 47" cigars, these are more of a marketing effort rather than a reflection of his personal habits.