A crucial component of playing penny slots or any other type of gambling is exercising responsible gambling. Knowing when to stop playing the machine, whether you're losing or one 21 slotson a winning streak, is a crucial part of responsible gambling. Setting predefined limits on wins and losses can help you keep control over your gambling habits, even though it's easy to get caught up in the thrill of winning. For example, think about cashing out and taking a vacation if you lose a certain amount or hit a particular profit threshold.