Before this question can be addressed you must 1st define what exactly you deem to be an *illegal gun*.
3
I don't know of any source of data that will answer the question.
There is no way to know. What is confiscated could be as low as 1 percent or as high as 10 percent of the total.
Since smuggled means brought into a country illegally and without knowledge, how do you think that number would be known?
Yes. Many people grow poppies in the US, and some are used illegally for opium.
The number of people murdered by guns in the USA (11,493) is 1/40 of that by cigarettes.
No way to know. The data is not collected in that format.
We do not have an exact number. A good estimate is around 300 million.
No one record. Several million persons.
No records of exact numbers. Estimated at ABOUT 320 million.
None. When made, 99.9% are legal, no matter where made. Just because it's against the law for YOU to own it doesn't make the weapon illegal. Technically the above is correct however as guns are not required to be registered in all states it is impossible to say how many are owned legally. Guns that are owned illegally are obviously not registered so there is no way to know how many there are.
Your question is to vague. Do you mean in the world? The US? North America, South America, Central America, Europe? Not as many as have died in traffic accidents.