But a drop in oxygen levels can cause a health emergency in people with heart or lung problems.

VOA: special.2009.07.14

Now, two large studies suggest that communities that pass laws to curb secondhand smoke get a big payoff -- a drop in heart attacks.

CNN: Big drop in heart attacks after smoking bans, studies say

All patients must be observed for six hours after their first dose, because Gilenya can cause a drop in heart rate after it is first given.

FORBES: Why Novartis' Approval Is Bad For Biogen

These claims are accompanied by the statistics from one area or another and of course a significant drop in heart attacks just as the smoking ban becomes active in that area.

FORBES: Smoking Bans Do Not Reduce Heart Attacks