No
Practically all countries banned DDT.
None, there is nothing dangerous/r-rated about there music
Yes, Quorn has been banned in some countries due to concerns about its labeling and potential allergic reactions.
Monosodium glutamate (MSG) is not banned in any countries. However, some countries have regulations on its use in food products due to potential health concerns and require it to be labeled on food packaging.
Yes. In China, Japan, and Germany.
The culture of any countries around the Mediterranean Sea.
As matter of fact, only one country left in the world has banned smoking, and it is the tiny Asian nation of Bhutan in the Himalayas.
As far as we know, President Obama is not "banned" from any countries. As with all presidents, he is more popular in some countries than in others, and certain countries like Iran or North Korea may have policies that discourage a US president from visiting, but it is doubtful that there is any official "ban" in place anywhere.
Not all countries compete; some smaller countries don't have any suitable athletes. Iraq has recently been banned from competing because of political interference in the sport selection process.
Turkey, Albania, Tunisia, Algeria... infact many so called countries where the majority is of Muslims, they suffer from their religious practice being banned. Yes, Muslims living in Muslim majority countries.
Yes, DMHA (dimethylhexylamine) is banned in several countries, including the United States, Canada, and Australia, due to safety concerns and potential health risks associated with its use as a stimulant in dietary supplements and sports performance products.
Yes, a political party can be banned in some countries if it is deemed to be a threat to national security, promotes violence, or goes against the country's constitution or laws.