A study says that marriage for gay men and lesbians is more dangerous than smoking.

The Family Research Institute, a Colorado based think-tank well-known for their anti-gay views, studied same-sex marriages in Denmark and Norway.

It claims that engaging in “homosexual behaviour” reduces life span by up to 24 years.

In contrast, the lifespan of a smoker is only 7 years shorter than that of a non-smoker.

Dr Paul Cameron said at the convention of the Eastern Psychological Association: “What justification is there for condemning smoking and endorsing homosexuality?

“Today, all across the Western world, school children are being taught the acceptability of homosexuality and the wrongness of smoking.”

The research found that in Denmark, where gay marriage was legal between 1990 and 2002, married heterosexual men died at an average age of 74.

The 561 married gay men died at an average age of 51.

Married women died at an average age of 78, compared to 56 years for the 91 lesbians.

In Norway, married heterosexual men died at an average age of 77 and the 31 gay men at 52.

Women married to men in Norway died at an average age of 81. The average life expectancy for married lesbians was 56.

“The consistency of reduced lifespan for those engaging in homosexuality is significant,” said Dr. Cameron.

“Given the greatly reduced lifespan for homosexuals, school children should be strongly and consistently warned about the dangers of homosexuality even more so than smoking. Those school districts which are introducing pro-gay curricula need to rethink their priorities.”

Dr Paul Cameron and Dr Kirk Cameron presented the convention with their research named the Federal Distortion Of The Homosexual Footprint.

Paul Cameron has published over 40 articles on homosexuality. None of them positive.

Read the editor of the Student BMJ’s comments on Paul Cameron’s research methods here