Gwyneth Paltrow smokes one cigarette every Saturday night.

The health conscious star allows herself a single smoke each week, and indulges in her favourite brand from her native America.

She admitted: ''My weakness is American Spirit cigarettes. I smoke one every Saturday night.''

The 'Iron Man 3' actress used to follow a macrobiotic diet, and although she has eased up on her strict food rules, she insists many people believe how much food she fries at home.

She added to Tatler magazine: ''People are always surprised that I have a deep-fat fryer. It's hidden away in the kitchen counter and makes the most incredible French fries.''

Gwyneth, 40, also claims she just had a mid-life crisis - although she didn't say what caused it - but claims she overcame it by going on a ''mad'' trip to a spa.

The Hollywood beauty - who is married to Coldplay singer Chris Martin, with whom she has two children, daughter Apple and son Moses - said: ''Midlife crisis? I just had one. So I spent three days at Mii Amo, in Arizona, with psychic massage, hiking and having my colours red. It was mad.''