Starbursts
Twizzlers
Skittles
For a long time, there was a health problem with the dye used to color the M&M shells red. That ingredient issue had been resolved, however, and red M&Ms are back on the market again today and are fine to eat.
M and M's came out first. M and m's came out in 1941, and skittles came out in 1974.
Basically, it depends on the size of the pack. Each M&M is about 1g. So, if you have a 20g pack there are approximately 20 M&M's in the pack.