Other possibilities :
A drug that promises to make you feel good that actually makes you feel bad.
A vaccine that promises to cure you that actually makes you ill.
An economic system that promises prosperity while creating poverty.
Food that creates malnourishment.
It's pretty obvious when you think about it. All you need is a bunch of cheap poison and a good marketing campaign.
Other possibilities :
A drug that promises to make you feel good that actually makes you feel bad.
A vaccine that promises to cure you that actually makes you ill.
An economic system that promises prosperity while creating poverty.
Food that creates malnourishment.
It's pretty obvious when you think about it. All you need is a bunch of cheap poison and a good marketing campaign.