Kahless makes a good point with her comment
As for switching addictions, how can you switch a food addiction when you still have to partake in it everyday?
Humans are habitual creatures, very much so. Habitual drug use is no exception. One part of the reason why some people use drugs excessively is because the drug use becomes a habit. To stop using one has to break the habit.
However habit is both the drug users worst enemy and best friend depending on the timing.
If one has used marijuana almost everyday in the previous two months then there is a strong habitual urge to use again today.
If one has not used marijuana in the previous two months then there is a strong habitual urge not to use today.
Breaking a habit is a waiting game that turns habit from your enemy into your friend. If you can just not use long enough then the new non using behaviour becomes habitual. One becomes a habitual non drug user and thus it is easier to not use.
Of course one can not use any marijuana at all and still exist but one cannot stop eating completely. Thus the habitual aspect to eating can never stop. Thus one can argue that a food addiction is harder to break than a drug addiction.
Of course how and what one eats will be in part determined by habit, but it is harder to stop a food addiction because one cannot stop eating completely.
UK politicians who admit to using marijuana
Current Prime Minister of the UK, David Cameron has stated that he is “not issuing denials” about newspaper stories which claim he had used marijuana
US politicians who admit to using marijuana
George W. Bush
Australian politicians who admit to using marijuana