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This is how you can meak a smoke bomb using potassium nitrate and sugar to. 
1st You will need to have potassium nitrate, sugar, a pie tin, hot plate/stovetop, have a oven mit or fire proof gloves, and tin foil.
2nd place more sugar then potassium nitrate in the pie tin and cook it till the sugar turns brown make sure not to burn the sugar and potassium nitrate -because it will start to smoke in the pie tin. 
3rd and last step place the brown mixture on to a sheet of tin foil be fast but careful the mixture is very hot and hardens very fast then roll it into a ball and poke a hole in it to light