Daniel Radcliffe. Radcliffe admits candidly that he ended up becoming a ‘party focused guy’ that used alcohol as a means to coping. His on screen performance in several of the later Harry Potter films is notable due to the fact that Radcliffe admitted to being ‘mostly intoxicated’ throughout the filming. Daniel managed to get himself into rehab, clean up, and get back on the straight and narrow again.
Daniel Radcliffe on alcoholism, starving himself, Harry Potter - and the day he fell in love
Daniel Radcliffe Reveals Secret Alcohol Addiction - Us Weekly