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.
Greenhouse Covering. Whether you're replacing existing greenhouse coverings or building a greenhouse you're sure to find the best greenhouse covering at FarmTek. Greenhouse glazing is the material that covers the greenhouse frame and the most widely used materials are polycarbonate and poly film.
Lean To Greenhouses. Browse our excellent range of Lean to Greenhouses for sale from the world's leading aluminium greenhouse manufacturers such as Vitavia, Halls, Eden, Rion, Elite greenhouses. We also offer the superb lean to wooden greenhouses from Swallow GB in 4ft, 6ft and 8ft widths that include installation in the price.