Card counting can give players a slight edge in blackjack, reducing the house advantage, but it doesn't guarantee consistent long-term winnings. The edge is typically small, requiring skill and concentration to track the count, adjust bets, and modify playing strategy. Casinos are aware of card counting and may take steps to detect and counter it. Additionally, the natural variance in blackjack means that even with an edge, players can experience losing streaks. While card counting increases the chances of success over time, it’s not a foolproof way to consistently beat the game.