The following are short term effects of tobacco EXCEPT:

Weakened immune system
Dulled taste buds
Bad breath
Nicotine addiction
Yellowed teeth

Weakened immune system, dulled taste buds, bad breath, and yellowed teeth can all be considered short-term effects of tobacco use. The only option that does not fit into this category is nicotine addiction, as addiction is typically a long-term effect that develops over time with continued tobacco use.

To determine the short-term effects of tobacco, we can look at the list of options given and remove the one that is NOT a short-term effect.

Let's analyze each option:

1. Weakened immune system: This is a known short-term effect of tobacco use. Smoking weakens the immune system and makes individuals more prone to infections and illnesses.

2. Dulled taste buds: This is also a short-term effect of tobacco use. Smoking can diminish a person's sense of taste, making food less enjoyable.

3. Bad breath: Bad breath is another short-term effect of tobacco use. Smoking can lead to persistent bad breath due to the chemicals and toxins present in tobacco.

4. Nicotine addiction: Nicotine addiction is NOT a short-term effect of tobacco use, but rather a long-term effect. Nicotine is the addictive substance found in tobacco products, and addiction can develop with regular use over time.

5. Yellowed teeth: Yellowed teeth are a short-term effect of tobacco use. Smoking causes teeth to become stained and discolored due to the tar and nicotine present in tobacco.

So, after evaluating each option, the answer is: The short-term effect of tobacco use that is NOT listed is nicotine addiction.

The short term effects of tobacco include weakened immune system, dulled taste buds, bad breath, and yellowed teeth. The exception is nicotine addiction. Nicotine addiction is a long-term effect of tobacco use, rather than a short-term effect.