News that Kittery police last month made the biggest drug bust in state history when they seized $200,000 worth of crack cocaine did not surprise local counselors and police. As stronger, deadlier drugs make their way into Maine, parents of teens and young adults need to be ever-vigilant and on the lookout for signs their children might be involved with illegal drug use, said both police and area counselors last week. Locally, marijuana remains the most popular and accessible drug among teen-agers, according to Sally Keck, a substance abuse counselor with York Hospital's Cottage Program, and York Police Detective Tom Cryan. But a growing number of deadlier drugs is making an impact. [continues 768 words]