Personally, the food we eat everyday is probably worse for us in both the short and long run than mild exposure to fumes from solder. For example monosodium glutamate (MSG), the FCC allows any amounts of this stuff to be used as an additive in foods.
What does it do? Its a flavour enhancer.
What are its side effects? MSG is a excitotoxin, basically, it "excites" your brain cells to the point where they die.
In addition, food manufacturers try to "hide" this ingredient by calling by other names such as "hydrolysed vegetable, whey, soy (etc.) protein, "natural flavour", "spices" etc. In america, 330 million tons of this stuff is produced each year! It is also addictive...ever wonder about the Lay's chips quote "betcha cant eat just one"... its hard to eat just one chip, because there filled with msg, there addictive. Why does the FCC allow this poison into our foods?...it makes all these crappy tastless foods taste great, and so we buy them... its an amazing marketing scheme, only at the cost of your health....have you ever tried cooking "Mr. Noodles" instant soup, pouring out the water, adding new hot water adding the little flavour package and the eating it?...tastes like crap...
how about aspartame? its used in basically every sugar free gum and diet pop...its effects are brain cancer...
The point is we consume these carcinogenic and harmful food additives daily, which kills us alot faster than the solder fumes. however, we should still strive to protect ourselves none-the-less from anything which may deteriorate our health. Think about it, why risk your health over a few dollars? imo, go buy what ever is best to keep you healthy and dont think twice about it, or you may regret it later.