In DSM, nicotine dependence is included under the general definition of substance dependence.  The essential feature of Substance Dependence is a cluster of cognitive, behavioral, and physiologic symptoms indicating that the individual continues use of the substance despite significant substance-related problems.
The Best Materials to Cover your Greenhouse. 1  Glass: The traditional greenhouse covering, glass is the preferred material for permanence. 2  Film Plastic: Film plastic is one sixth to one tenth of the cost per square foot of a glass covered structure.
How to Use Greenhouses to Grow Plants From Seeds. 1  Plan to sow seeds in your greenhouse at any time of the year. 2  Soak large seeds, such as beans or tree seeds, in a bowl of warm water overnight before planting them. 3  Fill seed-starting trays with moist potting soil.