Is nicotine a carcinogen?

Hello there, I'm curious to know if nicotine, the active ingredient in tobacco products, is indeed classified as a carcinogen? I've heard conflicting opinions on the matter and I'm hoping to get a clear and concise answer from someone in the know. Could you shed some light on this topic? Is nicotine known to cause cancer or does it simply play a role in facilitating cancer development when combined with other factors? Thank you in advance for your insights.