Because sometimes the best way he could use only occasionally, for example, he chose to use the drug as a resolution from the headache, but sometimes they may feel a headache pill is.
Sometimes the best way he could be just some of the opportunities as they choose to use drugs as a solution to the headache. But sometimes they may eat and still feel headaches.
Sometimes the best way his available just occasionally, as he chose to use a drug solution with a headache. But sometimes he would take and still feel a headache.