Well, some deodorants do contain Triclosan, which by some is considered carcinogenous. But blaming cancer strictly on deodorants would be pretty much like blaming getting drunk on the last drink only.
There may be substances in pretty much any deodorant that in high concentration are considered a health risk, but the short answer is no.
You can't specifically get sick with deodorant, but it's said that the aluminum in it can cause breast cancer.
No, you cannot get cancer from scratching too much.
You can get cancer because too much sun destroys the skin tissues causing cancer.
The cancer caused from tanning beds or too much sun is skin cancer.
You can actually sweat worse when you use too much deodorant. The best amount of deodorant to use is just enough to cover the armpit. You may want to try using different deodorants and antiperspirants. The deodorant/antiperspirant that you are using may not work for you.
Yes, skin cancer.
No
By putting as much description but not too much
cells dividing too much
No.
No
People putting it in.
There is no evidence suggesting that you can get cancer from being on electronics too much. Though you should get out and exercise often instead of just being on electronics.