Uh, that's not true at all. CFC's that most people are concerned with emitting aren't necessarily greenhouse gases, and the greenhouse contribution is not real

Uh, that's not true at all. CFC's that most people are concerned with emitting aren't necessarily greenhouse gases, and the greenhouse contribution is not really a primary concern with them. The primary concern is that many of them are catalysts with very very long active lifespans. As a catalyst (not a consumable reactant), a single CFC molecule is capable of destroying hundreds of thousands of ozone molecules in the upper atmosphere (or more). It's the catalytic nature that makes these things problematic and accumulative even in small amounts. The accumulation of these long-lived gasses would be measurable if everyone were blasting their laptop once a day, which is precisely why a number of them are banned completely. The ones generally used now are relatively better, but there is still plenty of reason to avoid emitting them if possible. Cigarette smoke isn't comparable when it comes to environmental concern, nor are most common combustion byproducts. Those definitely cause concern for different reasons, but aren't directly comparable to environmental concerns raised by CFCs.