Crotonaldehyde can be formed during combustion and is therefore present in substances such as cigarette smoke and car exhaust. It occurs in many foods but at low levels. Crotonaldehyde is produced mainly as raw material to produce the preservative sorbic acid (E200).
Crotonaldehyde is not normally found in tobacco, but can be formed in cigarette smoke.
Crotonaldehyde is found in low levels in meat, fish and vegetables.
According to WHO, it is not possible to classify crotonaldehyde in terms of whether or not it is carcinogenic to humans, while the United States Environmental Protection Agency (EPA) has classified crotonaldehyde as a possible carcinogen.
Swedish snus and foodstuffs
100 ml of wine contains 50 micrograms of crotonaldehyde, which corresponds to the content in 17 (x) 24 g cans of Swedish snus.
There are no national or EU legal limits for crotonaldehyde either in food or in smoke-free tobacco products. Crotonaldehyde was assigned a GOTHIATEK limit in 2016.