Areca nut - Much like coffee, the areca nut is a stimulant. However, it is chewed. There is a link between chewing this nut and an increased risk of oral cancer.
Wood dust - Wood dust is carcinogenic. If you're working around wood, be sure to wear a mask. The ingestion of wood dust is associated with nasal cancer.
Contraceptives - Researchers have found contraceptive pills increase women’s chances of developing cervical cancer. The longer you use them, the more the risk multiplies.
Hot tea - If you like a cup of tea to keep you going, make sure you let it cool down first. Very hot tea is associated with esophagus cancer.
Shopping receipts - In 2010, a study found that most shopping receipts use a chemical called bisphenol-A. It's a hormone chemical with links to an increased risk of cancer.
Implants - There is a slightly higher risk of cancer for people with implants. They increase the risk of anaplastic large-cell lymphomas.
Alcohol - It is sad but true–alcohol is bad for you in almost every way. Researchers have predicted that 6% of yearly cancer deaths worldwide are due directly to drinking.
Sunbeds - Any kind of sun bed will increase your exposure to UV light. When you are exposed so strongly, you increase your risk of skin cancer and cataracts.
Lack of veggies - Vegetables are obviously good for all kinds of things. If you are not getting enough of them, you are at higher risk of developing cancer.
Aluminium production - Inhaling aluminum fumes is associated with bladder and lung cancer.