The most logical answer is because adults have more experience driving than teens because most of the time, practice helps to make perfect. But there are some teens who are better drivers than adults and teens that aren't great at driving at all, and the same can be with adults!
Hey! The best way to quit smoking all together would be to get help through and follow a program. Since that is not an option " Get a doctor's support "is a good option. Positive energy your way!