8. Daniel Radcliffe - Harry Potter
While the two aforementioned actors physically chose to drink in pursuit of comfort and plaudits, Daniel Radcliffe unfortunately felt quite literally compelled to drink while filming the later Harry Potter films, in order to cope with the rigour of basically growing up on a film set for the better part of a decade.
Radcliffe admits he would routinely turn up to set drunk after partying hard the night before, particularly during filming of 2009's the Half-Blood Prince, and now struggles to watch many of the movies because he's acutely aware of which scenes he performed under the influence.
Radcliffe reportedly hasn't touched any drink since 2010, and considering the bold, left-field choices his career has been going lately, it seems like being free from the noise of the Potter franchise (and the allure of liquor) has probably done him a world of good.