10 years maximum.

https://uhs.berkeley.edu/tobaccofacts

Which is reasonanable. Styrofoam cup's are not.

How quick do other things take to breakdown?

Vegetables

5 days –1 month

Paper

2–5 months

Cotton T-shirt

6 months

Orange peels

6 months

Tree leaves

1 year

Wool socks

1–5 years

Plastic-coated paper milk cartons

5 years

Leather shoes

25–40 years

Nylon fabric

30–40 years

Tin cans

50–100 years

Aluminium cans

80–100 years

Glass bottles

1 million years

Styrofoam cup

500 years to forever

Plastic bags

500 years to forever

Just because dog-shit breaks down fast, does not give even a single dog the right to drop it on my lawn.