Cold Sore Triggers. While symptoms are not usually present with an initial infection, certain factors may trigger later outbreaks of a cold sore. These can include exposure to sunlight or other UV light, the common cold or flu, hormonal changes, and emotional stress.
It was said that Marilyn was an occasional smoker. Although, looking at some of these rare photos it appears the habit was more than occasional. The first time Marilyn was seen sporting a cigarette on screen was in Right Cross (1950), though in her very first screen test she lit and put out a cigarette. She appeared on at least one magazine cover smoking a cigarette, and she is smoking in bed in the opening scene of Niagara (1953).
The first part, that she dated 'most of the Rat pack', is untrue. She briefly dated Frank Sinatra, and in the late 1940s allegedly went on a single date with Peter Lawford. As for Dean Martin, he and Marilyn were good friends....and Marilyn was good friends with his wife Jeanne, who he married in 1949.