thriller comic from the 70s

Hi,I remember reading a comic in the 70s featuring a collection of slightly sinister thriller stories,not really horror or sci-fi but generally a concise tale with a bit of a twist in the end,very often along the lines of karma/ironic vengeance.
Memorable story topics were:


"Germ Warfare"(about germs which grow to the size of humans!)
A lady who marries a genie from a bottle
A man who bets a psychic he can't be injured by a fall,lets himself get tied to the floor so he will be too low to fall and then realises the predicted indury actually comes from the chandelier dropping on him!
A humanoid alien who beats a bullying human at an underwater swimming contest because he actually has gills!

I would be most grateful if anyone can tell me what I was reading?

Many thanks, Phil