no, lettuce is perfectly safe for hamsters. i am glad you are concerned about your fellow hamster.
Lettice Sandford died in 1993.
Lettice Fairfax died on December 25, 1948.
Lettice Knollys died on 1634-12-25.
Lettice Mary Tredway died in 1677.
Lettice Cooper died on July 24, 1994, in Coltishall, Norfolk, England, UK.
Lettice Cooper's birth name is Lettice Ulpha Cooper.
Lettice Curtis was born in 1916.
Lettice Sandford was born in 1902.
Lettice Knollys was born on 1543-11-08.
Lettice Mary Tredway was born in 1595.
You can't milk a hamster.
A hamster can eat most fruits and veg. If it is poisonous to a hamster they will know to avoid it. Lettice is the only food I would advise you to avoid as it can be known to give a hamster diohorrea.