Try a search with this phrase.
Vendors of Fraudulent Diabetes & Cancer Cures **
Use your favorite search engine and you will find warnings.
.. and find out for yourself.
Here is my question. If these sites are scams, Why can the government not shut them all down? And why does Google and Bing let them post ads?
And if you go to any of those sites, they so everything they can to get you.
Have you even been taken?
** Try the same phrase, but without the word 'Fraudulent'.