Original:
for (int i = 0; i < dagen.length; i++) {
	System.out.printf("%-12s %9.1f %12.1f\n", dagen[i], fijnstof[i], sigaretten);
}
------------------
Option 1:
for (int i = 0; i < dagen.length; i++) {
	System.out.printf("%-12s %9.1f %12.1f\n", dagen[i], fijnstof[i], fijnstof[i] / 6.0);
}
------------------
for (int i = 0; i < dagen.length; i++) {
    double blahblahblah = fijnstof[i] / 6.0;
	System.out.printf("%-12s %9.1f %12.1f\n", dagen[i], fijnstof[i], blahblahblah);
}