Just as David Cameron launches his campaign to boost national happiness, along comes grim news for the 12 million Britons taking happy pills. London-based researchers have just announced that antidepressants raise the risk of fatal heart attacks. This research is only the latest wake-up call for a nation hooked on happy pills. Might we finally heed the warnings and shake ­ourselves out of our pharmaceutical stupor?

It is high time we did: a small mountain of studies shows that antidepressant drugs are largely ineffective. But more than that, they can ruin lives by creating chronic dependency and a grinding ­hopelessness that ­sometimes leads to self-neglect and death.