As soon as you add a tax to something that money goes somewhere and politicians (or more often then not their offspring) will be profiting off it and then where

As soon as you add a tax to something that money goes somewhere and politicians (or more often then not their offspring) will be profiting off it and then where is the impetus to prevent it when it brings money in? Smoking could be completely phased out but it wont because it's just too profitable for the government.