No!  You should do your best ignore how other players play.  This can be dificult as there is often a lot of talk at a blackjack table about how players play, especially the player on “3rd base”, the last player at the end of the table who plays right before the dealer plays.  Though it’s hard to keep this in mind when somebody hits on 18, over time a bad player’s action will help you just as often as hurt you in blackjack.