Assuming: 1 pack/day, $10 a pack (this is close in my province), 5% interest, over 30 years, has a present value of $55k. I wouldn't be surprised if the numbers for alcoholism or heroin addiction are similar. Addiction is hugely expensive to the people afflicted and society at large (barring the usual discussion of smokers saving health care dollars by dying early).
If flying across the world/country and making other drastic changes really does stop the cycle with a high rate of success, we should consider funding it.