Societies typically institutionalize irrational people.
Your call it “addiction” but they call it a different way of life. Just because it’s different than yours, or they don’t act like you think they should, or they spend their money differently than you, or it even shortens their lives shouldnt give you the right to decide “what’s best” for them. Unless you are talking about institutionalizing them of course.
I am sure these people exist but I have never talked to them. Everyone I know that deals with addiction says it sucks and is not arguing for their "way of life". In other words, all the smokers I know hate it and wish they never started. Similarly my friends that struggled with alcohol abuse weren't arguing for a "way of life". They realized they needed to stop drinking or their family and marriage would probably be kaput.
I have only known 1 person with a gambling problem (not including myself lol) and ironically it is my cousin who is married to the gambling counselor... but yeah he basically had to tone it way down and doesn't gamble almost at all anymore. We still play poker for small stakes but I don't think he bets on sports anymore even when we go to Vegas. He blew a few thousand betting on NFL over a weekend and kept chasing his losses... It wasn't pretty.
Just curious where you draw the line. Do you think drugs like heroin or crack should be legal?